Eleanor Sidgwick

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Eleanor Mildred Sidgwick (1845–1936) was a British mathematician, physicist, and educational reformer who became one of the most rigorous investigators in the early Society for Psychical Research. Born Eleanor Balfour into a prominent political family — her younger brother Arthur Balfour would become prime minister — she came to psychical work by way of physics. In the early 1880s she worked alongside her brother-in-law Lord Rayleigh, the future Nobel laureate, on the precise determination of the electrical standards: using the method of Lorentz to re-measure the absolute value of the unit of resistance, and then helping re-specify the ohm, the ampere, and the volt. Her name appears with his on three papers in the Philosophical Transactions of the Royal Society, and her share of the labor was the meticulous recording of readings and the mathematics behind them. The figures she helped fix became the standards for commercial electrical units. It was the same demand for exactness that she would later turn onto claims that the dead could speak and that minds could touch at a distance.

In 1876 she married the Cambridge moral philosopher Henry Sidgwick. When he, together with Edmund Gurney and Frederic Myers, founded the Society for Psychical Research in 1882, she was drawn into its work from the outset, joining formally in 1884. What began as participation became stewardship. From 1888 she took over her husband’s editing of the Society’s Journal and Proceedings; she served as honorary secretary for much of the period around 1907 to 1932, and in 1908 became the Society’s first woman president. For some thirty years she was the steady analytical hand behind its major projects, among them the long labor of sorting the cross-correspondences. The work of the SPR was a shared enterprise; its analytical conscience, for a generation, was largely hers.

The largest of those projects was the Census of Hallucinations, a statistical survey of waking apparitions — including those said to coincide with a distant death — placed in her charge and written up in a report that was substantially her own. Some seventeen thousand people were canvassed; the recognized hallucinations ran to nearly two thousand, and the cases that seemed to coincide with a death fell well above what the death-rate alone would predict. She presented this as suggestive of a non-chance link, not as proof of one, and the hedge was characteristic. Her temperament in this work was skeptical, and pointedly so. She learned conjuring and the codes of stage performers in order to catch trickery, judged the slate-writer William Eglinton a clever conjurer and nothing more, and in an 1891 paper laid bare the methods of fraudulent spirit-photography. Her assessment of the medium Eusapia Palladino, after sittings in France in 1894 and at Cambridge in 1895 where the woman was repeatedly caught freeing a hand or using a foot, weighed heavily against the genuineness of the phenomena. Against the credulous physical-mediumship enthusiasms of contemporaries such as William Crookes, the contrast was plain.

The same deflation governed her most sustained inquiry. Her study of the mental medium Leonora Piper, running past six hundred pages and modestly offered as “a contribution,” granted that Piper somehow produced knowledge beyond ordinary means, yet argued that the “controls” who spoke through her were secondary personalities thrown up by Piper’s own mind, sometimes fed by information acquired telepathically — not the returning dead. Where she came to think some residue of telepathic evidence survived scrutiny, she said so with the same caution she applied to dismissing the rest, calling it an elusive but genuine fact of nature even as she warned against letting the imagination run away with the case. She never confused the residue with the wreckage around it. William James, who knew her work, thought her a worthy ally of her husband, with a rare power of holding her judgment in suspense.

Alongside this she built a second career in women’s higher education. She was involved with Newnham College, Cambridge, from its early years — as treasurer across some four decades, as vice-principal, and as principal from 1892 to 1910, succeeding the founding principal Anne Clough. Her leadership there was substantive, not ceremonial: she gave generously from her own means toward the college’s buildings and expansion, endowed research fellowships so that inquiry would be valued for its own sake, and campaigned for the right of women to take Cambridge degrees, a right not won in full for decades after. The administrative care, the head for figures, and the refusal of easy conclusions ran through both halves of her life.

What she represents in the history of esotericism is not a doctrine but a posture. The early psychical researchers hoped that questions usually left to faith might be settled by evidence, and Sidgwick embodied the hard version of that hope: that taking such claims seriously meant testing them hard enough to fail. Most did fail under her hand. She kept investigating anyway, on the view that a question worth asking is not answered by deciding the answer in advance.

→ Related: Henry Sidgwick · F W H Myers · Eusapia Palladino · William Crookes · Telepathy