TABLE OF CONTENTS xv 



PAGE 



1. Quantitative influence of correlation or compensation of growth 207-214 

 The struggle for existence the cause of abortion of flowers and 



fruits 207 



Influence of the sprouting of buds 208 



Influence of the size of leaves and leaflets .... 209 



Influence of the size of the parts in the flower . . . 211 



Correlation of vegetative and reproductive organs . . 212 



2. Qualitative influence of correlation ...... 214-217 



Relationship of direction ....... 214 



Chief roots and lateral roots 214 



Chief shoots and lateral shoots 214 



Aerial and subterranean shoots 215 



Formation of thorns . . . . . . . 215 



Configuration of leaves . . . . . . . 215 



Sporophylls 215 



Bud-scales 216 



Tendrils 216 



II. INFLUENCE OF EXTERNAL STIMULI 217-270 



A. Influence of gravity .......... 219-226 



1. Its relation to the disposition of organs 219-224 



In prothalli of Pteridophyta 219 



In embryo of Marsilia ........ 220 



In Cacteae 221 



In Thladiantha 221 



In regeneration 221 



In the whole plant 222 



2. Qualitative influence of gravity 224-226 



The shoots of the rhizome in Yucca and Cordyline . . 224 



Difference between chief shoot and lateral shoots . . 225 



B. Influence of light 227-259 



1. Directive influence of light 227-237 



Dorsal and ventral sides of dorsiventral organs . . . 227 



Gemmae of Marchantieae 227 



Germ-plants of thallose dorsiventral liverworts . . . 228 



Prothalli of ferns ; apogamous shoots ..... 228 

 Polar differentiation in germination of spores of Equisetum 



and some Fucaceae ....... 229 



Branch-system of Cupressineae 230 



Rhizome of Nuphar 231 



Distribution of roots in Ivy, Cacteae, and others . . 231 



Formation of tubers in potato 232 



Branching of plagiotropous mosses 232 



Position of leaves in dorsiventral Jungermannieae . . 234 



Dorsiventral sporogonia 236 



Branching in Algae 237 



2. Qualitative influence of light 238-259 



(a) Developmental stages in relation to light . . . 238-245 



In Algae 238 



In Bryophyta 239 



Hepaticae 239 



Musci . 241 



