Degeneration, [155], [279]

Digestion, [309]; amœba, [33]; hydra, [37]; worms, [47], [52]; insects, [66]; vertebrates, [73], [81]

Ear, [50], [64]

Echinoderms, [57]

Ectoderm, [37], [44]

Egg, [43]

Embryology, [43]

Emotions, [136], [230], [309]

Entoderm, [37], [44]

Environment, [158], [309]; God immanent in, [161], [175]; mirrored in human mind, [199]