_m._ Length of embryonic life 582 _n._ The process of hatching 583 The hatching spines 585 PART III. THE METAMORPHOSES OF INSECTS _a._ The nymph as distinguished from the larval stage 593 _b._ Stages or stadia of metamorphosis 594 _c._ Ametabolous and metabolous stages 594 THE LARVA 599 _a._ The Campodea-form type of larva 600 _b._ The eruciform type of larva 602 _c._ Growth and increase in size of the larva 608 _d._ The process of moulting 609 The number of moults in insects of different orders 615 Reproduction of lost limbs 619 Formation of the cocoon 619 Sanitary conditions observed by the honey-bee larva, and admission of air within the cocoon 623 THE PUPA STATE 625 _a._ The pupa considered in reference to its adaptation to its surroundings and its relation to phylogeny 631 _b._ Mode of escape of the pupa from its cocoon 632 _c._ The cremaster 636 Mode of formation of the cremaster and suspension of the chrysalis in butterflies 637 FORMATION OF THE PUPA AND IMAGO IN THE HOLOMETABOLOUS INSECTS (THE DIPTERA EXCEPTED) 640 _a._ The Lepidoptera 642 The changes in the head and mouth-parts 646 The change in the internal organs 647 The wings 654 Development of the feet and of the cephalic appendages 654 Embryonic cells and the phagocytes 655 Formation of the femur and of the tibia; transformation of the tarsus 656 The antennæ 657 Maxillæ and labial palpi 658 Process of pupation 660 _b._ The Hymenoptera 661