304 DEVELOPMENT OF ANIMAL LIFE IN TIME 



present, and those which have appeared at different epochs in the 

 past ; and 



2. That the particular argument supposed to be deduced from 

 the heterocercaUty of the ancient fishes is based on an error, the 

 evidence from this source, if worth anything, tending in the opposite 

 direction. 



At the same time, while freely criticising what he considered to be 

 a fallacious doctrine, Mr. Huxley expressly disclaimed the slightest 

 intention of desiring to depreciate the brilliant services which its 

 original propounder had rendered to science. 



