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III.   ORIGIN OF TASTE FOR SCIENCE.   203

attended specially to physics till appointed professor 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 determined 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 appointment to a surveying ship made me a comparative anatomist    that to . . . . forced me to paleontology. (17), First began to concentrate energies to one branch, when appointed . . . . (18) [My scientific tastes] were determined by