Evolution, [3]; conservative, [173]

Excretion, amœba, [33]; worms, [48], [53]; vertebrates, [73], [81]

Faith, [209], [256]

Family, [180]; origin of, Cf. [88], [178], [217]; results of, [181]

Flagellata, [39]

Ganglion, supra-œsophageal, [49], [54]; annelids, [64]. See [Brain]

Gastræa, [45]

Gastrula, [44]

God, [244]; knowable, [167]

Head, insect, [68]; vertebrate, [75]