The single most durable claim to come out of Carey and Perry's system, still circulating in modern esoteric writing under names like the Christ Oil or the sacred secretion, is that the cerebrospinal fluid, the clear liquid that actually cushions the brain and spinal cord, is a substance the earliest Christians supposedly understood under the name Christ: an inner force or fluid that could, under the right bodily conditions, rise up the spine to the pineal gland. Read as physiology, cerebrospinal fluid is real and its description is not invented; what is added on top is the specific claim that it is what scripture means by Christ, and that raising it is the literal event scripture describes under other names. Neither claim is independently supported outside this tradition's own literature.
The claim has a long afterlife that runs well past Carey and Perry's own 1920 book. Manly P. Hall's Occult Anatomy of Man, published in 1929, makes a related but separately authored argument about the spine as Jacob's Ladder and the skull as the seat of divine contents, discussed on Hall's own page. A century after Carey and Perry, modern esoteric compilations continue to restate versions of the same claim, usually without naming them as the source, sometimes describing the claustrum, a real but very differently understood structure deep in the brain, as the point where the fluid originates before its descent.
None of this is presented on this atlas as established anatomy, history or biblical scholarship. It is recorded as what a specific, named, datable movement claimed, and the pineal gland's own page separately explains why the associated third-eye and activation claims popular today do not hold up as physiology, whoever is currently making them.