"The Law of Substance" 17 



importance in our monistic system. The two 

 theories are just as intimately united as their 

 objects matter and force or energy. Indeed, 

 this fundamental unity of the two laws is self- 

 evident to many monistic scientists and philo- 

 sophers, since they merely relate to two different 

 aspects of one and the same object, the cosmos" 



( P . 76). 



" I proposed some time ago to call it the c law 

 of substance/ or the ' fundamental cosmic law ' ; 

 it might also be called the * universal law,' or the 

 1 law of constancy,' or the c axiom of the constancy 

 of the universe.' In the ultimate analysis it is 

 found to be a necessary consequence of the 

 principle of causality " (p. 76). 



I criticise these utterances below, and I 

 also quote extracts bearing on the subject 

 from Professor Huxley in Chapter IV. ; but 

 meanwhile Professor Haeckel is as positive 

 as any Positivist, and runs no risk of being 

 accused of Solipsism : 



"Our only real and valuable knowledge is a 

 knowledge of nature itself, and consists of pre- 

 sentations which correspond to external things." 

 . . . . " These presentations we call true> and we 

 are convinced that their content corresponds to 

 the knowable aspect of things. We know that 

 these facts are not imaginary, but real " (p. 104). 



2 



