64 CALIFORNIA ACADEMY OF SC[ENCES. 



that the origin of these qualities is known, and the 

 cause of their presence in the mind, despite the fact 

 that had not the mind the potential possibility of de- 

 veloping them they could never have been introduced. 



LAWS CONDITIONING EVOLUTION. 



If the above considerations upon individual variation 

 contain within them even a flimsy core of truth; if 

 natural selection even in its widest interpretation be not 

 creative; then, indeed, it is necessary to discard the 

 dogma of chance so much preached by the scientists of 

 the day, and admit that just as the formation of the 

 crystal is due to the working of natural law, so, too, 

 is the evolution of man and of all the diversified life 

 of the globe due to workings of the same natural law. 

 Prof. Cope, Prof. Hyatt and Haeckel have placed 

 especial stress upon the importance of the laws of 

 biology, and it will be necessary to consider some of 

 the laws which they have enunciated. The laws gov- 

 erning the evolution of life may be stated under three 

 heads: (1) laws of development, (2) laws of struc- 

 ture, and (3) laws of heredity. They may be diagram- 

 atically classified as follows: 



I. Laws of development. 



1. Bathmism or growth force. 



2. Phylogenic extent and density. 



3. Metabolism. 



a. Anabolism 



b. Katabolism. 



4. Sexual intensification. 



5. Acceleration and retardation. 



6. Law of concentration. 

 IL Laws of structure. 



1. Homology. 



2. Successional relation. 



