LAWS OF ENVIRONMENTAL CHANGE 85 



It may be of some comfort to the isolated student, 

 with his small shelf of books, to realize that there 

 are perhaps not a half-dozen libraries in America 

 which contain all the references given in this book. 

 The nearer one reaches the boundaries of our knowl- 

 edge, the smaller the amount, and often the smaller 

 the value of the literature, and the greater the value 

 of a proper orientation, which comes only with a 

 grasp of general principles. 



(The laws of physical and vegetational changes and their in- 

 fluence upon animals. The dynamic or process relation of the 

 environment.) 



BANCROFT, W. D. 



1911. A Universal Law. Science, N. S., Vol. XXX, pp. 



159-179. 



The law of adjustment or response to strain. A very 

 important paper viewed from the dynamic and pro- 

 cess standpoint. 



HENDERSON, L. J. 



1913. The Fitness of the Environment. An Enquiry into 

 the Biological Significance of the Properties of 

 Matter, pp. 317. New York. The Macmillan 

 Company. 



Valuable ecologically because of its exposition of the 

 orderly sequence and regulatory character of physico- 

 chemical and physiological processes, and the ap- 

 plication of chemical equilibria and the Phase Rule 

 to metabolic changes. He says, "Now there can 

 be no doubt that, when feasible, the ideal method 

 from the physico-chemical point of view to de- 

 scribe a material system is in terms of the phase 

 rule." p. 260. 



