Note 40 — CONTENTS

(p. 27). S. Rudolph Wagner. Der Kampf um die Seele, vom Standpunkt der Wissenschaft. (Sendschreiben an Herrn Leibarzt Dr. Beneke in Oldenburg.) Göttingen, 1857, p. 94 note. “Gauss said, the author (of a certain psychological work) spoke of a want of exact measurements in the case of psychical phenomena, but it would be good if we only had clumsy ones, one could then make a beginning; but we have none. There is here wanting the conditio sine quâ non of all mathematical treatment, i.e. whether and how far the changing of an intensive into an extensive quantity is possible. Yet this is the first and indispensable condition; then there were also others. On this occasion Gauss spoke also about the usual incorrect definition of quantity as an ‘ens’ which is capable of being increased or diminished; one ought rather to say, an ‘ens’ that admits of being divided into equal parts....”