CHAP, in THE APPEAL TO BIOLOGY 37 



between different worlds of thought. This effort 

 reappears in Drummond's later book, The Ascent of 

 Man, of which we may have something to say here- 

 after. Otherwise, the later treatise is largely an in- 

 version of the previous one. It obliterates the 

 theological discontinuousness between the natural 

 and the spiritual man, which had been so strangely 

 supported by the assertion that the laws of physical 

 nature must be viewed as continuous and operative 

 in all regions of experience, even the most spiritual.] 



