in.] ORIGIN OF TASTE FOE SCIENCE. 203 



attended specially to physics till appointed pro- 

 fessor of natural philosophy. This induced me 

 to give up chemistry, and to devote myself 

 definitively to physics. (9) Solitary observing 

 for years [as director of an observatory]. (13) 

 Professional duties and civil engineering . . . . ; 

 official exploration of .... (14) Largely deter- 

 mined by service in north polar and equatorial 

 expeditions. (15) My interest in astronomy was 

 very small indeed, until I was appointed [to the 

 directorship of an observatory]. 



Chemistry. (8) The university inviting me to 

 fill the chair of . . . , gave my work its bent. 



Geology. None. 



Zoology. (1) Largely determined by being 

 appointed .... (10) Partly by my selection 

 of medicine as a profession. (13) My appoint- 

 ment to' a surveying ship made me a comparative 

 anatomist . . . . , that to .... forced me to 

 palaeontology. (17) First began to concentrate 

 energies to one branch, when appointed .... 

 (18) [My scientific tastes] were determined by 



