Direct answer
The documentary record shows that Westcott and Hort moved in several exclusive or selective Cambridge societies, some literary or intellectual, some more private, and at least one explicitly concerned with supernatural investigation. These bodies were not all the same kind of institution, but together they form a pattern too substantial to ignore. The pattern is made sharper, not weaker, by the memoir language itself: an oath “which binds the members to a conspiracy of silence,” Maurice’s warning that there was “evil attaching to every exclusive society,” and Hort’s own response: “Could there be a more beautiful or delicate recommendation? So I joined …”
Key documentary pages





What the combined pattern suggests
Looked at one by one, each group can be minimized. Looked at together, the pattern changes. The Apostles club supply secrecy, oath, and formative influence; Eranus shows continuity of elite inner-circle life; Hermes shows the classical-philological setting; and the Ghostly Guild adds overt supernatural inquiry. The strongest historical conclusion is therefore cumulative: Westcott and Hort belonged to a world of selective, semi-private, intellectually ambitious association that likely shaped how they perceived authority, tradition, and evidence — and that a careful investigator cannot simply presume these circles were innocent because later admirers defend them.
Why Hermes Trismegistus matters
Readers unfamiliar with the name should note that Hermes Trismegistus is not merely a decorative classical label. In later esoteric history he becomes a touchstone for Hermeticism and appears repeatedly in Rosicrucian, occult-revival, ceremonial-magic, and some Masonic / esoteric streams. That does not prove that every person who mentions Hermes belongs to every such body. It does explain why the name is spiritually charged and why Bible-following Christians notice it.
Where Freemasonry belongs in the discussion
Freemasonry belongs in the discussion as a real line of inquiry, even if a final documentary bridge has not yet been found. The memoir record places Westcott and Hort in oath-bound and secretive circles, while Hort’s own reading notes speak of Rosicrucians, Freemasons, and the “Invisibles” as part of a secretive world tied to Communism as “the grand secret and the object of all.” That does not by itself prove lodge membership. It does mean that comparisons with wider secret-society culture are not gratuitous and should not be dismissed merely because defenders prefer a more innocent reading.