CONTENTS. 



iitiXKluciory Remarks ... . . 1 



I — The Anatomical Condition of tlie Cell . . 2 



A. Form of Cells . . . . > ib. 



B, Size of tlie Cell .... 8 

 C The Cell-membrane ... .9 



a. Physical Properties ... ib. 



h. Structure . . . .10 



c. Chemical Conditions ... 24 



D. Cells in their E-eciprocal connexion . , 30 



E. Contents of Cells . . , . 36 



a. Primordial Utricle, Protopkbm, and Nucleus ih, 



b. Cell-sap ..... 40 



c. Granular Structures . . . .41 

 cl Compounds dissolved in the Cell-sap . 47 



F. Origin of the Cell . . . .49 



a. Division of the Cell , . 50 



b. Free Cell-formation . . . .57 

 1 L — The Physiological Conditions of the Cell . . 61 



A. The Cell as an Organ of Nutrition . . 65 



a. Absorption of Watery fluids . . iK 



b. Diffusion of the Sap in the Plant 70 

 e. Nutrient Matters . . . . 77 

 d Elaboration of the Nutriment . . 88 

 e. Secretions . . . . 93 



/ Evolution of Heat . . . .101 



f> The Cell as an Organ of Propagation . 104 



a. The Multiplication of Plants by Division . ik 



k Piopagation by Spores and Seeds , 110 



a. Propagation by Spores . . .111 

 * Propagation of Thallophyi^es . ih. 



Propagation of the Cryptogams ) ^^^j 



having Stems and Leave J 



b. Propagation by Seeds . . 125 

 ' The Pollen . . .127 

 « The Ovule ... 129 



' / The Origin of the Embryo . 131 



C The Cell as an Oi'gan of Motion . . 139 



•55-% 



