CONTENTS. 



PART I. 



THE CHEMICAL PROCESSES IN THE NUTRITION OF 

 VEGETABLES. 



Page 

 Subject of the Work . . . . . 1 



The Constituent Elements of Plants . . .2 



The Assimilation of Carbon . . . .4 



Composition and Properties of Humus . . 5 

 Absorption of Humus ..... 9 



Fertility of different Soils . . . . . 13 



Influence of Manure . . . . .15 



Proportion of Carbonic Acid in the Atmosphere . 17 



The Atmosphere is the source of Carbon in Plants . 19 



Influence of the Shade on Plants . . 27 



Exhalation of Oxygen by Plants . . . .33 



Neglect of Chemistry by Botanists . . 35 



Object of Experiments in Physiology . . .37 



Conditions essential to Nutrition . 39 



