CONTENTS 



Xlll 



§ 7. The Influence of External Conditions 



§ 8. Rhythmical Irregularities of Growth-ratio 



page 

 197 

 203 



§ 1. 



§2. 

 §3- 

 §4- 

 §5- 

 §6. 



§7- 



§8. 



CHAPTER VII 



BEARINGS OF THE STUDY OF RELATIVE 

 GROWTH ON OTHER BRANCHES OF BIOLOGY 



Heterogony and Taxonomy : Sub-species and Taxo- 



nomic Forms ........ 204 



Heterogony in Groups Higher than the Species . 212 



Heterogony and Evolution . . . . .216 



Heterogony and Comparative Physiology . . 224 



Relative Growth and Genetics . . . .229 



Relative Growth, Embryology, and Recapitulation 234 



General Approach to the Problem of Qualitative 



Form-change ........ 240 



Conclusion ......... 243 



Bibliography ........ 245 



Addenda . . . . . . . ... 257 



Index of Authors ....... 267 



Subject Index ........ 270 



Index of Organisms ....... 274 



