on may-flies, [430];

on metamorphosis of Bombus, [497];

on scales, [397];

on spiral fibre, [129]

Pad, [105]

Paedogenesis, [142]

Pagenstecher on development of Mantis, [247]

Palaeacrididae, [309]

Palaeoblattariae, [239]

Palaeoblattina douvillei, [238] f.