Insects, breathing of, [242] and following;

and disease, [269].

Instincts, [74]-98, [101], [109].

Jelly-fish, [40], [46].

Leading shoot, [144]-146.

Life, length of in various creatures, [61]-64;

nature of, [239] and following.

life-jelly, [25], [27], [46], [238], [249], [251], [303], [356].

Light, growth and turning of plants toward, [147]-148, [151]-152, [156]-157;

movement of animals toward, [159]-164, [196]-197.