CONTENTS 



Preface vn 



CHAPTER I 



Historical Sketch 1 



The discovery of the cell — Preformation and epigenesis Kaily theories 

 cell-formation — Early observations on the cell contents — The foundation 

 of the cell theory — Elaboration of the cell theory — The protoplasm doctrine 

 — The new conception of the cell — Fertilization and embryogeny The be- 

 ginning of the modern period in cytology — Bibliography 1. 



CHAPTER II 



Preliminary Description of the Cell 



Description of the cell — The differentiation of cells — Bibliography 2. 



CHAPTER III 



Protoplasm 



Physical properties — Protoplasm as a colloidal system — Microdissection 

 Chemical nature of protoplasm — Varieties of protoplasm — The plasms 

 membrane — Protoplasmic connections — Vacuoles — Protoplasm aa the sub- 

 stratum of life — Micromeric theories — Chemical theories — Conclusion 

 Bibliography 3. 



CHAPTER IV 



The Nucleus 59 



Occurrence — General characters — Nucleoplasmic ratio — Structure of nucleus 

 — Nuclei of bacteria and other protista — The function of the nucleus 

 Bibliography 4. 



CHAPTER V 



The Centrosome and the Blepharoplast 



The centrosome — Occurrence and general characters Individuality 

 Centrosomes in Algae— Fungi — Bryophytes— Conclusion The blepharo- 

 plast — Occurrence — In flagellates— In fchallophytes En byrophytes In 

 pteridophytes — In gymnosperms — In animals— Conclusion Bibliograph 



CHAPTER VI 



Plastids and Chondriosomes 



Plastids — General nature and occurrence— Leucoplasts ( Jhromatophores 

 Starch— The pyrenoid— Elaioplasts and oil bodies The eyespol The 

 individuality of the plastid— Chondriosomes General nature and occur- 

 rence — Physico-chemical nature— Origin and multiplication Function 

 Relation of chondriosomes to plastids— Conclusion Bibliography 6. 



CHAPTKK VII 



1 ■ ; • ; 



Metaplasm; Polarity 



Metaplasm— Extruded chromatin- The senescence of the cell Polarity 



Metabolic gradient Bibliography 7. 



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