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| | Science Timeline |
 | | In 1867, Wilhelm Griesinger published the second edition of his psychiatric textbook in which he said that mental diseases are brain diseases and that the onset of psychosis was experienced as an intrusion of a 'thou' on the 'I,' or ego. |
 | | In 1872, Julius Wilhelm Richard Dedekind, in Stetigkeit und die Irrationalzahlen, maintained that the essence of the continuity of a line consists in the possibility of dividing that by a single point, i.e., an irrational number, e.g., a fraction. |
 | | Dedekind regarded arithmetic as a "natural consequence of the simplest arithmetic act, that of counting" (Dedekind 1872:4). |
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