CONTENTS 



SECTION I 

 PROBLEMS, CONCEPTS AND THEIR HISTORY 



BY JANE M. OPPENHEIMER 



The Early Embryology of the Embryology and Naturphilosophie: 

 Greeks: Aristotle 1 Goethe and Von Baer 8 



Embryology and the Renaissance: Embryology and Evolution: Dar- 

 Fabricius, Harvey 3 win and Haeckel 13 



Embryology and the New Micro- 

 scope: Preformation and Mal- 

 pighi; Epigenesis and Wolff .... 6 



SECTION II 

 METHODS AND TECHNIQUES 



BY JANE M. OPPENHEIMER 



Introduction: Some General Con- 

 siderations 23 



Observation vs. Interference as an 

 Approach to Embryological Prob- 

 lems 26 



25 



Techniques of Interference with the 

 Embryo 31 



SECTION III 

 CELLULAR STRUCTURE AND ACTIVITY 



Chapter 1. Cell Constitution . 



BY FRANCIS O. SCHMITT 



Techniques of Analytical Cytology 39 



The Problem of Fixation 41 



The Colloidal Organization of Pro- 

 toplasm 41 



Water and Dissolved Substances . . 42 



Particulate Systems 42 



Lipochondria (Golgi System) .... 45 

 Fibrous Systems of Cytoplasm .... 46 



The Paracrystalline (Mesomor 

 phic) State; Tactoids, Coacer 

 vates and Long-Range Forces . . 



Sol-Gel Transformations, Contrac- 

 tility and the Cell Cortex 54 



The Cell Membrane 56 



Some Physical Chemical Considera- 

 tions of Morphogenetic Processes 59 



39 

 39 



53 



