A strip of the outer germinal layer, the ectoderm, thickened, folded into a groove, closed itself into a nerve canal, became a spinal column, became the brain. And as the foetal slime condensed into fibrous connective tissue, into cartilage, the colloidal cells beginning to show gelatinous substance instead of mucin, he saw in certain places the connective tissue take lime and fat to itself out of the sera that washed it, and begin to form bone. Embryonic man squatted in a stooping posture, tailed, indistinguishable from embryonic pig; with enormous abdomen and stumpy, formless extremities, the facial mask bowed over the swollen paunch; the story of his growth seemed a grim, unflattering science, like the cursory record of a zoological family tree. For a while he had gill-pockets like a roach. It seemed permissible, or rather unavoidable, contemplating the various stages of development through which he passed, to infer the very little humanistic aspect presented by primitive man in his mature state.