Discovery Lab Answers

Richard Hodgson: Experiments and Data

Richard Hodgson was an Australian-born psychical researcher who became one of the most methodologically rigorous investigators of his era ^[4]. He served as Executive Secretary of the American Society for Psychical Research (ASPR), described in the sources as “a man of signal ability… sometime Lecturer in the University of Cambridge” ^[5].

Slate-Writing Investigations (Eglinton, 1886–1887)

Hodgson’s earliest major investigative work documented in the sources concerns the medium William Eglinton and the phenomenon of slate-writing — the claimed production of written messages on sealed or locked slates without normal means ^[1].

His methodology here was comparative and forensic rather than experimental in the controlled-trial sense. He worked by:

• Cross-comparing witness accounts of the same séances, identifying internal inconsistencies between reports from different observers ^[2]
• Conducting his own practical tests, such as tracing drawings on thin note-paper held under a table, to assess whether “a few seconds” would be sufficient time to produce the effects described by witnesses — concluding that it would be ^[1]
• Examining precautionary failures, specifically noting that accounts did not specify what measures, if any, prevented the medium from accessing slates when they were not “in actual use” ^[1]

His conclusion — that Eglinton’s slate-writing was consistent with fraud — aligned with a parallel experimental approach taken by S.J. Davey, who demonstrated how little human observation and memory could be trusted under the conditions obtaining at Eglinton’s sittings ^[2]. The sources note that Hodgson “applied a more searching and complete criticism” to this evidence than other contemporaries, while reaching the same conclusion ^[2].

Leonora Piper Investigations (1888 onward)

The bulk of Hodgson’s experimental output, and arguably his most significant contribution to the primary literature, concerns the medium Leonora Piper. He conducted and recorded sittings with Piper over an extended period, publishing two major reports:

• “A Record of Observations of Certain Phenomena of Trance” (1892), Proceedings of the SPR, Vol. VIII, pp. 1–167 ^[5]
• “A Further Record of Observations of Certain Trance Phenomena” (1897–98), Proc. SPR, Vol. XIII, pp. 332–333 ^[5]

The sittings with Piper were extensive — numbering in the hundreds over approximately 25 years — and were observed by multiple investigators including William James, Oliver Lodge, Frederic Myers, and James Hyslop ^[3].

What the data involved:

• Piper produced trance communications in which sitters received information they subsequently verified through third parties as factually accurate ^[3]
• She produced speech and writing in foreign languages she reportedly did not know ^[3]
• Hodgson personally observed simultaneous independent communications: Piper writing with one hand (reportedly from the communicator “George Pelham”) while another communicator (“Phinuit”) spoke — and a third communication proceeding simultaneously on a different subject ^[3]

Hodgson also collected Piper’s own account of her early trance experiences, including her initial contact with the medium J.R. Cocke in 1884, which she relayed to Hodgson in 1888 ^[5].

Methodological Character

Across both bodies of work, Hodgson’s approach combined:

• Adversarial skepticism early in his career (the Eglinton investigation was essentially a debunking exercise)
• Long-term systematic observation with Piper, accumulating records across years and multiple independent observers rather than relying on any single sitting
• Comparative analysis of witness testimony to identify where memory and observation failed

The sources note that Hyslop published a subsequent extended record of Piper observations (Vol. XVI, 1901, pp. 4–649) that built on Hodgson’s groundwork ^[5].

Skeptical Critiques

What critics argue. The reliability of witness testimony under séance conditions was contested even among Hodgson’s contemporaries. The sources document the argument — raised in the context of the Eglinton investigation — that “human observation and memory can be trusted” very little “under conditions such as obtain” at these sittings ^[2]. This critique applies to the Piper record as well: sitters were told information they then verified through others, a process critics have argued is susceptible to selective reporting and confirmation bias.

What the experimental data show. Hodgson’s own Eglinton work actually demonstrates this vulnerability: by comparing accounts from different witnesses to the same séances, he showed that testimony was internally inconsistent, and he used that inconsistency as part of his case against Eglinton ^[1][2]. His Piper investigations were designed partly to address this — using multiple independent observers and long-run records rather than single-sitting testimony.

Analysis. Hodgson moved from a position of near-total skepticism (Eglinton) to concluding that Piper’s phenomena constituted genuine evidence ^[3][4]. Whether that shift reflected the evidential weight of the Piper data or a change in critical standards is a question the sources raise without resolving. Independent replication of the Piper findings under conditions that controlled for the failure modes Hodgson himself identified in the Eglinton work was not systematically undertaken during his lifetime.

For broader context on this era of investigation, the Foundations section covers the historical and theoretical background of nineteenth-century psychical research.