CHAPTER XI. COMPARISON OF THE FORMATION OF THE GERMINAL LAYERS AND OF

THE EARLY STAGES IN THE DEVELOPMENT OF VERTEBRATES. Pp. 275-310.

Formation of the gastrula, pp. 275-292. The formation of the mesoblast and of the notochord, pp. 292-300. _The epiblast_, pp. 300-304. Formation of the central nervous system, pp. 301-304. Formation of the organs of special sense, p. 304. Summary of organs derived from the three germinal layers, pp. 304-306. Growth in length of the Vertebrate embryo, pp. 306-309. The evolution of the allantois and amnion, pp. 309, 310.