Ingenuity in lower races, [277].

Inhibition: and art, [283];

in lower races, [263].

Initiation, [90], [153].

Insanity, [24], [51], [254];

increase of, [289].

Insomnia, [35].

Instincts, persistence of, [99].

Intelligence and culture, [260].

Interest, hunting-pattern of, [280].