In 1874 a farmer in upstate New York privately printed a pamphlet about anaesthesia and circulated it himself. Almost no original copies can now be found. One of them changed William James's mind, and Harvard turns out to hold the archive where the hunt should start.

Start with the object, because the object is the point.

It is small. Thirty-seven pages, octavo, privately printed in Amsterdam, New York, in 1874, with no publisher named on the title page. It was not issued through an ordinary commercial publisher or bookselling network. Blood circulated it himself, including by post; James later told interested readers to write directly to Blood for a copy.

The title is The Anæsthetic Revelation and the Gist of Philosophy. The author was Benjamin Paul Blood, and what he was announcing, in thirty-seven pages, was that the central secret of philosophy had turned out to be available under anaesthesia.

And you cannot buy one.

First, a correction to the story you may have heard

It is tempting, and I was tempted, to call this the founding document of the Western attempt to take chemically induced mystical experience seriously as evidence about the world. It isn't, and the real lineage is more interesting.

Humphry Davy was deliberately inhaling nitrous oxide at the Bristol Pneumatic Institution in 1799–1800, recording radical alterations of consciousness and something very close to metaphysical insight, and publishing the results as natural philosophy. Jacques-Joseph Moreau de Tours used hashish self-experimentation in the 1840s as a deliberate method for investigating insanity, arguing that personal drug experience could yield psychological knowledge. Fitz Hugh Ludlow's The Hasheesh Eater (1857) devoted hundreds of pages to drug-induced vision, religion and philosophy, and did so seventeen years before Blood printed a word on the subject.

So Blood did not open the file. What he did was something more specific and, for our purposes, more consequential:

Blood's 1874 pamphlet is one of the hinge documents through which nineteenth-century drug self-experimentation entered William James's psychology of religion, and therefore one of the direct ancestors of the modern scientific argument over whether altered states can tell us anything true.

That claim survives scrutiny. James took the problem from Blood explicitly, said so in print, and was still working on it the month he died. If Davy belongs to the prehistory of psychopharmacological self-experimentation, Blood is a direct ancestor of the modern psychological study of mystical experience.

The man who wouldn't let it go

Blood was born in Amsterdam, New York, in November 1832, the son of a prosperous landowner, and stayed there for all eighty-six years of his life. The available descriptions read like a dare: farmer, poet, philosopher, amateur strongman, lightning mental calculator, inventor, debunker of spiritualist mediums. He wrote constantly and published almost nothing conventionally. His preferred venue was the letters column of the Amsterdam Gazette, the Utica Herald, the Albany Times.

That last item matters more than it looks. Blood was not a credulous man; he spent part of his life exposing the tricks of séance mediums. Whatever happened to him under anaesthesia, he did not arrive at it wanting to believe in spirits.

The standard account is that it began in 1860, with nitrous oxide administered during a dental operation. That specific story comes from later biographical material rather than from the pamphlet itself, including an account given by Blood's daughter, and it is worth knowing that. The 1874 text is vaguer and broader: it speaks of anaesthetic agents generally, and of an experience that had been usual with him for nearly fourteen years.

Either way, something opened in the moment of surfacing: not under, but coming out, in the seam between anaesthesia and ordinary consciousness. And then it faded. Of course it faded. That is the whole problem, and Blood was honest enough to make the fading part of the theory rather than an embarrassment to be explained away.

Here is the detail I find hardest to get past: he waited.

Fourteen years of repeated self-experimentation before publication, with nitrous oxide and, later, with ether. In his own account, he published in 1874 not to define what the illumination meant but to signal that it existed, and to show where philosophy had fallen short of it.

Fourteen years of going back to check, before saying anything in public. There are contemporary psychedelic research programmes that would struggle to match that instinct.

The circulation

Because the pamphlet was distributed by hand and by post rather than through the trade, its reach is a function of Blood's address book, and his address book was extraordinary for a man who, by his own description, farmed in a way and was much idle.

By 25 April 1874 the pamphlet had reached the attention of the London press: The Examiner listed it that week, correctly noting the thirty-seven pages, and commented on Blood's claim in the same issue. (Whether the paper held the object itself or worked from a circulated bibliographical notice, I can't currently establish.)

Then, on 7 May 1874, Alfred Tennyson wrote back.

The Poet Laureate told Blood that he had never had any revelation through anaesthesia, but that he had experienced something adjacent since boyhood: a waking trance, brought on by silently repeating his own name to himself, in which individuality dissolved into what he called boundless being. Not a confused state, he insisted: the clearest of the clear. Then, characteristically, he apologised for the feebleness of the description, having just produced one of the most precise accounts of ego dissolution in nineteenth-century English.

Hold that letter in mind, because it comes back.

And in November 1874, in the Atlantic Monthly, a thirty-two-year-old Harvard instructor reviewed the pamphlet.

What James did with it

William James's review is a masterpiece of hedged fascination. He is sniffy about the gas as a route: something that dulls the mind and weakens the will could hardly be the final channel for truth. He warns readers that most of them will conclude Blood is crack-brained. He complains about the prose, which is fair, and about the coinages, which is also fair.

And then, having covered himself, he advises serious students of philosophy to write to the author for the pamphlet.

That sentence is the moment this becomes a lineage rather than an incident. James did not just review it. He recruited for it.

Then he inhaled the gas himself. In 1882 he published his own account of nitrous oxide intoxication in Mind, opening by stating plainly that he was prompted to make the observations by reading Blood's pamphlet. His conclusion is the one everybody quotes without knowing where it came from: depth beneath depth of apparently blinding evidence, and then, as sobriety returns, nothing left but a few disjointed words. He kept the sheets he had scrawled during the experience. Sober, they were drivel. At the time, he wrote, they had been fused in the fire of infinite rationality.

That tension, overwhelming noetic conviction coupled with the difficulty of carrying its content back into ordinary consciousness, remains one of the central epistemic problems in psychedelic research. It was formulated in 1882 by a man who had been sent a pamphlet.

Blood stayed in James's work for the rest of his life. The Varieties of Religious Experience (1902) quotes him directly and footnotes the 1874 pamphlet by page number, with James noting that Blood's tracts were privately printed and distributed by himself at Amsterdam.

And here the circle closes beautifully. In the same discussion of mysticism, James also reproduces Tennyson's letter to Blood, the waking-trance passage. So the sequence runs: Blood prints the pamphlet → Tennyson replies to Blood → James, decades later, prints Tennyson's reply as evidence in the founding text of the psychology of religion. Blood's private mailing list became James's data.

James went further than footnotes. He made the trip to Amsterdam and met the man, afterwards describing him to a correspondent as a son of the soil with extraordinary power over the English tongue. When James asked a local for directions to the house, the citizen's reply was: Yes, Paul is quite a correspondent!

Then, in the early summer of 1910, dying, James wrote his last essay. It is called "A Pluralistic Mystic," it appeared in the Hibbert Journal that July, and it is about Benjamin Paul Blood. James gives the final word not to himself but to Blood: There is no conclusion... there are no fortunes to be told, and there is no advice to be given. Farewell!

James died a few weeks later. The closing words of the last piece he published in his lifetime were Blood's.

Where the survivors are

So how many originals are left?

Nobody has counted properly, and the catalogues make counting hard. But physical copies can be identified at four institutions, each via a separate route rather than the same record appearing four times:

That last one is a genuinely useful find, because it means the pamphlet entered the medical collecting stream as well as the philosophical one. Somebody, at some point, filed Blood under anaesthesia rather than under metaphysics, which is precisely the fault line the pamphlet sits on.

There are likely to be more. Nineteenth-century pamphlets habitually survive bound into composite volumes: six or eight unrelated tracts stitched together by a collector and catalogued, if at all, under the first item only. That is one particularly plausible hiding place, and it is invisible to every search anyone reading this could run from a laptop. Note also that the surviving digitised copies have been rebound by their libraries, so we have no reliable evidence of the original construction of the thing. What an untouched copy actually looks like is, at present, an open question.

And now the strange part

There is no visible market.

Search the antiquarian trade for Blood and you will find dozens of listings dated 1874. Inspect them and they are all print-on-demand facsimiles (2013, 2016, 2022, 2025), some bound in new leather with gilt spines, which is a genuinely surreal object: a luxury reproduction of something its author circulated privately.

Filter for first editions: nothing. Filter for signed: nothing. Search the indexed auction records: I cannot find a documented sale of an original 1874 pamphlet.

That is not proof that none has ever sold. Dealer catalogues and older auction archives are patchily indexed, small ephemera routinely change hands privately, and no amount of internet searching can establish a negative. For comparison, a first edition of Blood's posthumous Pluriverse (1920), conventionally published, containing the Anaesthetic Revelation text, inscribed by its editor Horace Kallen, has recently been on the market at around $750.

The absence of a visible market tells us more about the scarcity of appearances than about any reliable valuation. What it does not tell us is a price.

The thing I missed first time: Harvard has Blood's own archive

This is the lead that changes the shape of the hunt, and I should have found it sooner.

Houghton Library holds the Benjamin Paul Blood papers, 1860–1928 (MS Am 1452–1452.1). Roughly three boxes, one linear foot. The catalogue scope note describes letters, mostly to Blood, often in response to his writings, along with a few letters and typescripts by him, an autograph manuscript poem, and many clippings of his newspaper pieces from Amsterdam.

And one more item, which stopped me dead. The collection-level scope note (OCLC 122372633) lists a galley proof of William James's "A Pluralistic Mystic."

Think about what that object is. James's final published essay, in proof, about Blood, sitting in Blood's own papers. Sent to its subject, presumably, in the last summer of James's life. Blood kept it. It survived him by nine years of accumulation and then went to Harvard.

The finding aid includes a series titled Letters to Benjamin Paul Blood. I cannot say from the online description whether the original Tennyson letter of 7 May 1874 is in those boxes, or which James letters are, and I am not going to claim it. But that series is, by construction, the place where responses to the 1874 pamphlet would have accumulated. This is not a hypothetical archive. It exists, it is processed, it has a call number, and you can request it in the reading room.

Before anyone goes looking at Farringford or in SPR material, this is the first stop.

The dream copy

Now the openly speculative part, clearly labelled as such.

Somewhere in 1874, Blood addressed an envelope to Cambridge, Massachusetts. What happened to that copy?

James was a systematic annotator. Better than that: Blood is demonstrably inside the system.

James marked passages and then wrote out his own indexes on the blank pages at the back of his books. One such volume survives: his copy of Emerson's Essays: First Series (Boston, 1869), now in the William James Collection at Houghton, call number AC85 J2376 Zz869e. On the endpapers, in James's hand, is an index of key passages. Two of the entries are "tasteless water of souls (Blood) 60" and "Anaesthetic revelation, 60." He also ruled a vertical line in the margin beside the passage on page 60 of "Self-Reliance" that prompted them.

So we can watch him doing it. Reading Emerson, James hit a line about the soul, thought of Blood, thought of the anaesthetic revelation, and filed both into his private retrieval system at the back of the book. Blood was not a passing enthusiasm; he was an index entry, a category James used to think with.

And he read the pamphlet itself closely enough to quote it accurately in 1902 and to structure an essay around its author in 1910.

Which makes the possibility tantalising. I want to be careful here, because tantalising is not probable. There is presently no evidence that James's copy survives, still less that it carries marginalia. He might have annotated it heavily. He might have barely marked it. He might have lent it, lost it, quoted from notes, or consulted a different copy in 1902. Romantic reconstruction is not evidence, and the honest position is that we don't know.

What makes this exciting is not that the hypothesis is likely. It is that the hypothesis is testable.

In 2019 Ermine L. Algaier IV published Reconstructing the Personal Library of William James, an annotated bibliography of some 2,554 entries across roughly 2,862 volumes of James's library held at Harvard, recording for each one the call number, provenance, bookplate, accession record, autographs, inscriptions, ownership marks, indexical annotations, markings and marginalia.

So the question "did James's copy of Blood's 1874 pamphlet survive, and does it carry his hand?" is not a mystery. It is a lookup, followed if necessary by a reading-room request. Somebody with that book open and a HOLLIS search could settle it in an afternoon.

I would very much like to be that somebody.

And if the answer is no, if his copy was lent, lost, or sorted out with the ephemera, the search widens rather than ends:

Sometimes this is how ephemera vanishes: not destroyed, simply filed under something else.

Why it matters more than it looks

It would be easy to file this as book-collecting whimsy. It isn't.

The arguments in contemporary psychedelic research about noetic quality, about ineffability, about whether the conviction of insight carries any epistemic weight at all: a great many of them run back through James's Varieties, and Varieties runs in part back through a thirty-seven-page pamphlet its author circulated privately.

The chain is direct and documented. Blood, roughly 1860, under anaesthesia. Blood 1874, the pamphlet. James 1874, the review that told philosophers to send off for it. James 1882, the self-experiment, explicitly prompted by it. James 1902, the framework the field still uses, quoting Blood and reprinting Tennyson's reply to Blood. James 1910, the last word, given away to Blood.

We built part of a science on that chain, and one of its earliest links is, as a physical object, extremely hard to find.

There is one more thing, and I think Blood would have enjoyed it.

The thesis of the pamphlet is that the revelation cannot be held. It arrives whole, it is entirely convincing, and it will not come back across the threshold into ordinary consciousness. You are, as he put it, forever half a second too late.

The pamphlet itself has turned out to be very nearly as difficult to hold as the experience it describes. Present in the record, quoted, footnoted, decisive. As something you could put your hand on, mostly gone.

There is no conclusion. Farewell.

What's established and what isn't

Established: the 1874 publication details and page count; private printing and self-circulation; Blood's dates and biography; the Examiner notice of 25 April 1874; Tennyson's letter to Blood of 7 May 1874; James's Atlantic review of November 1874 and his advice to obtain the pamphlet from the author; James's 1882 nitrous oxide account and its explicit debt to the pamphlet; the citation in Varieties (1902) and James's reprinting there of Tennyson's letter to Blood; James's visit to Blood in Amsterdam; "A Pluralistic Mystic" (Hibbert Journal, July 1910) as the last piece James published in his lifetime, closing on Blood's words; original copies at Michigan, Wisconsin–Madison, Harvard and the National Library of Medicine; the existence, call number and series structure of the Benjamin Paul Blood papers at Houghton; the two Blood-related entries in James's handwritten index at the back of his copy of Emerson's Essays: First Series (Houghton, AC85 J2376 Zz869e), as reported by Crane; the existence and scope of Algaier's catalogue of James's Harvard-held library.

Not established: the original physical construction of the pamphlet (all inspected copies are rebound); the exact printing date, and therefore the interval before the Examiner notice; whether the Examiner held a copy or worked from a notice; whether any copies were ever sold; the total number of surviving originals; the number of Harvard physical copies as opposed to catalogue records; whether James's own copy survives, and whether it carries marginalia; whether the Tennyson letter or specific James letters sit in MS Am 1452; the item-level record for the "A Pluralistic Mystic" galley proof, which is described in the collection-level scope note (OCLC 122372633) but which I have not yet confirmed against a folder-level Houghton entry (cite the exact folder before treating it as settled); whether any original has ever come to auction. "No auction record found" is not "no copy has ever sold."

Provenance note: the specific story of a nitrous oxide dental operation in 1860 derives from later biographical material, including an account by Blood's daughter, not from the 1874 text, which refers more generally to anaesthetic agents over nearly fourteen years.

Open, and worth doing, in order: (1) Houghton MS Am 1452–1452.1, Letters to Benjamin Paul Blood; (2) Algaier's bibliography and HOLLIS, for a Blood entry with James provenance; (2a) Houghton AC85 J2376 Zz869e, to see James's Blood index entries in the flesh; (3) Tennyson library and archive records; (4) SPR and Gurney material; (5) composite pamphlet volumes, for anyone with institutional access.

Sources

Blood, B. P., The Anæsthetic Revelation and the Gist of Philosophy (Amsterdam, N.Y., 1874). James, W., review of the above, Atlantic Monthly, November 1874. James, W., "Subjective Effects of Nitrous Oxide," Mind, 1882. James, W., The Varieties of Religious Experience (1902), Lectures XVI–XVII, notes to Blood 1874, pp. 35–36, and the Tennyson letter. James, W., "A Pluralistic Mystic," Hibbert Journal, July 1910. The Letters of William James, vol. II (James's visit to Amsterdam, N.Y.). Tennyson to Blood, 7 May 1874, as reprinted in contemporary periodical notices. Benjamin Paul Blood papers, 1860–1928, MS Am 1452–1452.1, Houghton Library, Harvard University (OCLC 122372633). Crane, Gregg, "Intuition: The 'Unseen Thread' Connecting Emerson and James," Modern Intellectual History 10:1 (April 2013), 57–86. See n. 22 for James's index entries on Blood at the back of his copy of Emerson's Essays: First Series, Houghton AC85 J2376 Zz869e. Algaier, E. L. IV, Reconstructing the Personal Library of William James: Markings and Marginalia from the Harvard Library Collection (Lexington Books, 2019). National Library of Medicine Digital Collections, catalogue record nlm:nlmuid-9710396-bk. Moon, Kuza & Desai, "William James, Nitrous Oxide, and the Anaesthetic Revelation" (2017). Background on the earlier lineage: Davy, Researches, Chemical and Philosophical (1800); Moreau de Tours, Du Hachisch et de l'Aliénation Mentale (1845); Ludlow, The Hasheesh Eater (1857).