CONTENTS. 



CHAPTER X. 



Chemical and Physiological Studies ix Connection with 

 THE Cell. 



General Considerations — Metabolism — Essential Food-Materials 

 — Enzymes — Constructive Processes — Details of Vifa/ 

 Processes — Starch — Chlorophyll — Elaboration of Nitrogen 

 — The Cell-sap and Sap-conduction — Transpiration and 

 Root-pressure — Gaseous Interchange during Assimilation 

 and Respiration — Assimilation of COo and HjO — Variations 

 of Protoplasmic Aotivitj- under the Influence of Different 

 Physical Agencies — Production of Heat, Light, and Elec- 

 trical Phenomena in the Cell, ...... 156-188 



APPENDIX TO CHAPTER X. 



The Physics of the Absorption of Water, Salts, and Gases 



by the Cell 189-191 



Index, 193-207 



EEEATA. 



Frontispiece, line 1 , for Samhuctw read Lupidvu. 

 ,, line 7, for Lupvlvs read Sambncits, 



Page 12, lines 13 to 15 should read thus : — 



" is meant a condition of tension inside a cell resulting from the intake 

 of water by osmosis (see Chap, x.) until an equilibrium is set up 

 between the sap inside the cell and the fluid outside." 



Page 127, line 37, after "oospore" insert "elongates into a structure 

 known as the proemhryo which has a cell cut off from its lower end, 

 and this," &c. The remainder of the proemhryo forms the snspensor. 



Page 128, line 4, omit the words "and, in some cases, the foot (an absor- 

 bent organ)." 



