36 ESSAYS IN PHILOSOPHY 



of science are to be credited with the value of 

 truth, is the proximate seat of that nature for which 

 we are seeking as explanatory of what the Continu- 

 ous Copula really is. At next hand to Nature, our 

 mind itself — the mind of each of us — is that 

 Copula. This truth will become clearer as we pro- 

 ceed with the analysis of evolution. 



(4) Logical Unity. — It is of course obvious that 

 evolution, like every other scheme of conception, 

 must have its parts conformed to the laws of logical 

 coherence, and that in this sense Logical Unity is 

 a factor in the very notion of evolution. But we can 

 now see that it is present there in a sense far pro- 

 founder and more vital. In fact, according to the 

 result of the preceding step in our analysis, Logical 

 Unity is simply the direct and manifest version of 

 causation in terms of mind, which we just now came 

 upon as the authentic meaning of the causal Copula. 

 As the logic of induction sends us directly to the 

 organic or a priori activity of thought for a warrant 

 of science, and thus indicates mind to be the I'eal 

 nature of the Omnipresent Energy, it now becomes 

 evident that the vague thread of kinship running 

 through all phenomena is the thread of logic, and 

 that the suggested common parentage of all is just 

 the parentage of thought. The unity of logic, the 

 unity of congruous conceptions, is the only unity 

 that joins by one unbroken tie the diverse forms of 



