CONTENTS. 



INTRODUCTION. 



General considerations on Animal and Vegetable 



Life, . . . 13 



PART I. 



HISTOLOGY OF PLANTS AND ANIMALS. 



CHAPTER I. 



On the Individualitt oe the Cells, - - 31 



On the Chemical Composition of the Vegetable 

 and Animal Tissues, - - - 47 



CHAPTER II. 



On the Dbtelopment and Propagation oS Cells, 51 



1. Formation of Cells from Nuclei, - - 51 



2. Formation of Cells by Division, - 55 



3. Formation of Cells by Gemmation, - - 59 



"' '" CHAPTER III. 



On the Transformation of Cells into Tissues, •' 62 



CHAPTER IV. 



On the CoNTRACTiLiTir of the Tissues, - - - 73 



