Fish destroyed, [425]

Fletcher on parthenogenesis, [498]

Flight, [416]

Floral simulators, [254] f.

Flying-machine, model for, [417]

Foenus, [563]

Foetus of Hemimerus, [218]

Foramen, occipital, [92], [94]

Forbes on Blattid, [235]

Forceps of earwigs, [208], [209]