220 ENGLISH MEN OF SCIENCE. [CHAP.
as seen in the combined with what I may call the accident of having been allowed to explore part of it in an official capacity. (14) Largely determined by my service in north polar and equatorial expeditions.
Geology.-(7) Subsequently much influenced by being thrown, at aet. 19, on my own judgment and resources in founding a mining colony in the backwoods of . . . . and carrying it out quite alone.
Zoology.-(2) Strongly confirmed and directed by the voyage in the . . . . (13) My appointment to the surveying ship . . .. made me a comparative anatomist, by affording opportunities for the investigation of the structure of the lower animals.
Botany.-(5) They were directed to botany purely through accidental circumstances [which led to a prolonged residence in an imperfectly civilized country].