432 LIFE OF PROFESSOR HUXLEY 



presaion wliich he gave to the world of the interaction of 

 a series of revolutionary ideas and conceptions (begotten of 

 the labours of his closing years as a working zoologist) 

 which were at the period assuming shape in his mind. 

 They have done more than all else of their period to 

 rationalise the application of our knowledge of the Verte- 

 brata, and have now left their mark for all time on the 

 history of progress, as embodied in our classificatory 

 systems. 



He was in 1882 extending his important observations 

 upon the respiratory apparatus from birds to reptiles, 

 with results which show him to have been keenly ap- 

 preciative of the existence of fundamental points of 

 similarity between the Avian and Chelonian types — a 

 field which has been more recently independently opened 

 up by Milani. 



Nor must it be imagined that after the publication of 

 his ideal work on the Crayfishes in 1880, he had forsaken 

 the Invertebrata. On the contrary, during the late '70's, 

 and on till 1882, he accumulated a considerable number 

 of drawings (as usual with brief notes), on the Mollusca. 

 Some are rough, others beautiful in every respect, and 

 among the more conspicuous outcomes of the work are 

 some detailed observations on the nervous system, and an 

 attempt to formulate a new terminology of orientation of 

 the Acephalous Molluscan body. The period embraces 

 that of his research upon the Spirula of the Challenger 

 expedition, since published ; and incidentally to this he 

 also accumulated a series of valuable drawings, with 

 explanatory notes, of Cephalopod anatomy, which, as 

 accurate records of fact, are unsurpassed. 



As you are aware, he was practically the founder of 

 the Anthropological Institute. Here again, in the late 

 '60's and early '70's, he was most clearly contemplating a 

 far-reaching inquiry into the physical anthrojaology of all 

 races of mankind. There remain in testimony to this 

 some 400 to 500 photographs (which I have had carefully 



