“Number is that property of a group of distinct things which remains unchanged during any change to which the 263 group may be subjected which does not destroy the distinctness of the individual things.”
Source: The Number-System of Algebra, (1890), p. 3; Reported in Robert Edouard Moritz. Memorabilia mathematica; or, The philomath's quotation-book https://archive.org/stream/memorabiliamathe00moriiala#page/81/mode/2up, (1914), p. 263
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Henry Burchard Fine 3
American academic 1858–1928Related quotes
"Kinds of Killing" https://web.archive.org/web/20121111032625/http://www.thatsmags.com/shanghai/article/1008/kinds-of-killing (2011) (original emphasis)

"The Origins and Effects of Our Morals: A Problem for Science", in The Essence of Hayek (1984)
1980s and later
Source: Classification and indexing in science (1958), Chapter 1: The need for classification, p. 11.

“Crowd mentality is a kind of simultaneous psychosis which may take possession of any group.”
Source: Farewell to Revolution (1935), p. xi, Foreword