viii Contents 

 Chapter 2. Cellular Metabolism 70 



BY H. B. STEINBACH AND F. MOOG 



Glycolytic and Oxidative Mecha- The Regulation of Metabolism in 



nisms 71 Development 83 



The Control of Cellular Metabolism 79 



Chapter 3. Cell Division 91 



BY HANS RIS 



Introduction 91 Analysis of Mitosis 93 



Description of Mitosis in the White- 

 fish Blastula 91 



SECTION IV 

 THE NUCLEUS AND CYTOPLASM IN DEVELOPMENT 126 



Chapter 1. The Role of Nucleus and Cytoplasm 126 



BY G. FANKHAUSER 



Introduction 126 Qualitative Changes: Experiments 



Quantitative Changes in Cyto- Invohdng Hybridization be- 



plasm or Nucleus 126 tween Two Species 141 



Other Experimental Approaches . 146 



Chapter 2. Gene Action 151 



BY CURT stern 



The Need of Genie Material for Type of Genie Action 157 



Development 151 Dependent and Autonomous De- 



Quantitative Variability of Genie velopmental Processes 159 



Content 152 Homeotie Mutants 161 



Qualitative Variability of Genie Genetic Asymmetries 161 



Content 153 Differentiation 163 



Time of Genie Action 155 



SECTION V 

 EMBRYOGENESIS: PREPARATORY PHASES 170 



Chapter 1 . Gametogenesis, Fertilization and Parthenogenesis . . . 170 



BY albert TYLER 



Gametogenesis 170 Artificial Parthenogenesis 201 



Fertilization 181 



Chapter 2. Cleavage, Blastulation and Gastrulation 213 



BY DONALD P. COSTELLO 



Determinate and Indeterminate Cleavage without Nuclei 216 



Cleavage 216 Redistribution of Egg Substances 



