286 BRAINS OF RATS AND MEN 



relationships, the recognition of any epiphenomena 

 not integrally articulated with the cosmos as this is 

 knowable, the injection of any metaphysical daemons 

 or entelechies into natural processes, these favorite 

 expedients of the philosophically minded when con- 

 fronted with unresolved problems, merely bar the way 

 to further scientific advance. Whatever justification 

 there may be in philosophy for a pluralistic universe, 

 natural science knows naught of it. The cosmos which 

 we study in experience by the scientific method is a 

 single order, whose manifestations, after experimental 

 analysis, must be redintegrated into a coherent system 

 of interrelated uniformities, whose processes, in short, 

 conform to a single code of laws.^ 



Lawful change in phenomenal manifestations is 

 one of the most fundamental principles of the system 

 of nature, and the determination of these sequences 

 and the formulation of their laws is the scope of evolu- 

 tionary science. The essential factor in this field of 

 inquiry is not the quantitative determination of re- 

 lations of matter and energy, for the sum-total of 

 these (so far as present scientific analysis has gone) 

 may be regarded as constant; it is, rather, the pat- 

 terns in which the units (simple or complex) of struc- 

 ture and behavior are combined inter se. The various 

 subdivisions of science have as their materials each a 

 particular group of these patterns of matter and en- 



* This is not necessarily true in other realms, e.g., mathematics, aa 

 MacMillan (1925, p. 97) has pointed out. 



