THE CORRELATION OF PHYSICAL FORCES. 509 BY W. R. GROVE, Q.C., M.A., V.P.R.S.. CORRESPONDING MEMBER OF THE ACADEMIES OF ROME, TURIN, ETC FOURTH EDITION. LONDON: LONGMAN, GREEN, LONGMAN, ROBERTS, & GREEN. THE the sense in which I have used it, having become recognised by a large number of scientific writers, it would produce confusion were I now to adopt another title. It would, perhaps, have been better if I had in the first instance used the term Co-relation, as the words 'correlate,' 'correlative,' had acquired a peculiar metaphysical sense somewhat differing from that which I attached to the substantive correlation. The passage in the text (p. 247) explains the meaning I have given to the term. Twenty years having elapsed since I promulgated the views contained in this Essay, which were first advanced in a lecture at the London Institution in January 1842, and subsequently more fully developed in a course of lectures in 1843, I think |