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Budapest, June 5, 1912
VII, Erzsébet-körút 54
Dear Professor,
Many thanks for your interesting information; I am pleased that you spent the Whitsun holiday so pleasantly.
I have been shaken by a kind of scientific fever. I read a little book by Otto te Kloot about “The Thinking Horses” (Hans, Mohammed, and Zarif) (ed. Berlin, Wilh. Borngraeber),1 in which remarkable mathematical achievements of these horses are described (deriving square and cube roots, division, subtraction of large numbers). I am convinced that in these (in my view, flawlessly correct) experiments, induction plays the main role. That would be a proof of the correctness of my supposition that animals and primitive people, in which the cs. did not hypertrophy at the expense of the instincts, are better instructed about events in their surroundings than we are. (Prof. Edinger's2 attempt at an explanation touches on the possibility of induction.) The ucs. Ψ. is an organ for physiological qualities, i.e., for physical quantities, just as the cs. is an organ for ucs. Ψ. qualities.