CONTENTS 



CHAPTER I 



Nucleus and Cytoplasm 



A. The Cytoplasm 



1 . The Cytoplasi)i proper . 



2. TJie Cell Membrane 



3. The Centrosome 



4. Chondriosornes . 



5. Metaplastic Bodies 



B. The Nucleus .... 



C. Mitosis .... 



I. The Division of the Cliromosonies^ and their Relation to 

 the Resting Nucleus . 



J- 



4- 



5- 

 D. Amitosis 



Chrofnatin and Linin 



Nuclear Membrane atid Karyolymph- 



Karyosontes and Prochromosomes 



The Achromatic Figure, 



PAGE 



I 

 I 

 I 



3 

 4 



4 

 4 

 4 

 6 



13 

 18 



19 

 '9 

 21 



24 



CHAPTER n 



Meiosis ...... 



A. Meiosis in the Male .... 



1. Meiosis in Toniopieris onisciformis 



2. Meiosis in Lepidosiren par ado xa 



3. Meiosis in Certain Insects 



B. Divergent Views of the Process of Meiosis 



1 . Parasyndesis and Telosyndesis . 



2. The Mutual Relations of the Homologous Chro^nosome. 



during Sytidesis 



3. Meiosis with Tetrad Formation 



ix 



28 

 31 

 31 



37 

 41 

 43 

 43 



4S 

 49 



