A man's opinion of danger varies at different times, in consequence of an irregular tide of animal spirits; and he is actuated by considerations which he dares not avow.
Tobias SmollettA mere index hunter, who held the eel of science by the tail. Index-hunter is a term used mockingly, meaning one who acquires superficial knowledge merely by consulting indexes. The '[holding] the eel of science by the tail' allusion was used in 1728 by Alexander Pope (q.v.).
Tobias Smollett