Fly, orchid, [55].

Flying-dragon, [64], [158].

Flying fish, [64].

Fœtal teeth of whales, [7].

Food, effects on pigs, [99].

Footsteps of Connecticut, [131].

Foraminifera, [186].

Formally moral acts, [195].

Formation of eye and ear, [51].

Forms, substantial, [186], [272].