Prototracheata, pp. 382-387. Myriapoda, pp. 387-395. Insecta, pp.
395-429. _Embryonic membranes and the formation of the layers_, pp.
400-406. _Formation of the organs_, pp. 406-417. _Special types of
larvæ_, pp. 417-419. _Metamorphosis and heterogamy_, pp. 420-429.
Arachnida, pp. 431-455. _Formation of the layers and general
development_, pp. 431-446. _Formation of the organs_, pp. 446-455.
Formation of the layers and embryonic envelopes in the Tracheata,
pp. 456-458.