CONTENTS 



CHAPTER I 



PAGE 



NUCLEUS AND CYTOPLASM ..... i 



A. THE CYTOPLASM . l 



1. The Cytoplasm proper . . ! 



2. The Cell Membrane ... 3 



3. The Centrosome . . 



4. Chondriosomes . 



4 



5. Me tap last ic Bodies ... 



B. THE NUCLEUS . 



4 



C. MITOSIS x 



o 



1. The Division of the Chromosomes, and their Relation to 



the Resting Nucleus .... z 3 



2. Chromatin and Linin . . jo 



3. Nuclear Membrane and Karyolymph . ! 9 



4. Karyosomes and Prochromosomes . jo 



5. The Achromatic Figure . . . 2I 



D. AMITOSIS 



24 



CHAPTER II 



OSIS 



2o 



A. MEIOSIS IN THE MALE . . 



1 . Meiosis in Tomopteris onisciformis . . ^ 



2. Meiosis in Lepidosiren paradoxa . 37 



3. Meiosis in Certain Insects . 4 r 



B. DIVERGENT VIEWS OF THE PROCESS OF MEIOSIS 43 



1. Parasyndesis and Telosyndesis . . . -43 



2. The Mutual Relations of the Homologous Chromosomes 



during Sy tide sis ... 4 g 



3. Meiosis with Tetrad Formation . .49 



