. CONTENTS. 



PAGB 



279 

 Relation of Transpiration to Absorption . . - ^ 



Adaptations of Plants to Dry Climates . . 



Chief Effects of Transpiration upon the Plant . . - - - 

 Influence of Transpiration upon Amount of Moisture m the Air , SHI 

 Effect of Transpiration upon the Soil . 283 



Do Leaves absorb Aqueous Vapor? 



CHAPTER X. 

 ASSIMILATION. 



APPROPRIATION OF CARBON, OR ASSIMILATION PROPER . . , 



Conditions of Assimilation 



Assimilating System of the Plant ~~ 



Chlorophyll 



Origin of the Granules 



Occurrence of the Granules * 



Structure of the Granules 



The Chlorophyll Pigment, and its Extraction **> 



Spectrum of Chlorophyll 



Fluorescence of Chlorophyll 2 



Plants devoid of Chlorophyll 2 



"Colored" Plants 29 * 



Etiolation 2 



Chlorosis 2 



Autumnal Changes of Color 297 



Chlorophyll in Evergreen Leaves 298 



The Raw Materials required for Assimilation, and their Reception 



by the Assimilating Organs 299 



Absorption of Carbonic Acid by Water Plants 299 



Absorption of Carbonic Acid by Land Plants 300 



Diffusion of Gases 801 



Passage of Gases through Epidermis free from Stomata 302 



Passage of Gases through Stomata 308 



Composition of the Atmosphere 803 



Practical Study of Assimilation 306 



Energy 307 



Classification of the Rays of the Spectrum 308 



The Depth to which Light can penetrate Green Tissues 809 



Quality of Light which penetrates the Tissues of a Leaf .... 309 



Effect of Colored Light upon Assimilation 310 



Measurement of the Amount of Assimilation 312 



Engelmann's Method 314 



Effect of Artificial Light upon Assimilation 316 



Relations of Temperature to Assimilation 316 



Effect upon Assimilation of Variations in the Amount of Carbonic 



Acid furnished the Plant 818 



