CONTENTS OF VOLUME I.

Introduction. Pp. [1‑16].

Chapter I. The Ovum and Spermatozoon.

General history of the Ovum, pp. [17‑25]. Special history of the Ovum in different types, pp. [26‑65]. The Spermatozoon, pp. [65‑67].

Chapter II. The Maturation and Impregnation of the Ovum.

Maturation of the Ovum, and formation of the polar bodies, pp. [68‑79]. Impregnation of the Ovum, pp. [79‑86]. Summary, p. [86].

Chapter III. The Segmentation of the Ovum.

Internal phenomena of Segmentation, pp. [88‑92]. External features of Segmentation, pp. [92‑122].

Introduction to Systematic Embryology. Pp. [125‑130].

Chapter IV. Dicyemidæ and Orthonectidæ. Pp. [131‑137].