Semen and Marrow (the subject of this page) are treated as a single, paired correspondence in the body of Table 777. The pairing links the generative fluid (semen) with the inner, vital substance of the bones (marrow). In classical and Hermetic physiology, marrow was considered the source of semen—the two being the same essential substance at different stages of refinement. This is not a modern biological claim but a symbolic identification: semen is the “marrow” of the reproductive system, the most concentrated essence of life, stored in the bones and expelled in generation. The unity of the two terms points to the root substance of the physical vehicle in both its static (marrow) and dynamic (semen) aspects.

Position on the Tree of Life

This correspondence falls at scale step 31 bis (the bis indicating a sub-division between Path 31 and Path 32). On the Tree, 31 bis corresponds to the region of Malkuth considered as the actual physical body—the densest, most material vehicle of the soul. It is the “Body” proper, as distinct from the breath, fluids, or structures that compose it. Semen and Marrow here represent the coarsest, yet most potent, bodily essences—the raw material of incarnation.

Historical context

The identification of semen with marrow is ancient and widespread. In the Hippocratic treatise On the Seed (5th–4th century BCE), semen is described as a product drawn from the entire body, but especially from the marrow and the moist parts of the brain. The idea was systematized in Galenic medicine: marrow, brain, and semen were all considered “humors” derived from the same nutritive fluid, with marrow being the most condensed form of that fluid inside the bones, and semen the purest expression of it outside the body. Jewish esoteric tradition (the Zohar) echoes this: the “white drop” of semen is said to issue from the “marrow of the spine” (the spinal cord), which itself derives from the “marrow of the brain.” In alchemy, the “marrow of the bones” becomes synonymous with the prima materia of the human body—the fixed salt that must be dissolved and coagulated to produce the Philosopher’s Stone. Semen, in parallel, is the volatile form of that same salt. The pairing thus compresses a dual-natured substance—fixed (marrow) and volatile (semen)—into a single symbol. Table 777 follows this exact tradition by placing both terms together in the column for the Body.

How the object appears in Table 777

In Liber 777, this entry is listed under the column The Body for scale step 31 bis. Unlike other steps that give a single substance (Blood at step 31, Breath at 11, Solid tissues at 32 bis), step 31 bis presents Semen, Marrow as two inseparable aspects of one thing. The paired term serves as a reminder that the body’s most essential substance is both the interior support (marrow) and the exterior generative force (semen). In ritual, this correspondence is invoked when working with the physical body as a vessel—the densest level of matter, yet the very seat of life’s continuation.