Julian HUXLEY (1887-1975) British biologist and philosopher. 3 L.A.S., London January-February 1936, to French zoologist and geneticist Georges Teissier (1900-1972); 3 pages in-8 and 2pages in-4, on letterhead of the Zoological Society of London; in English. Preparation of article published with Georges Teissier in Nature (no. 3471, May 9, 1936, pp. 780-781), Terminology of relative Growth. January 1st. Sends him a letter from "Dr. R.A. Fisher [1890-1962], the mathematician and biologist, who has often helped me in my research [...]; he prefers 'Growth' to Coefficient à Constant"... - February 6. He has drafted a note for Nature which he will send to her for validation as soon as it is typed. He explains the details of this work: "I have adopted the term Equilibrium Constant for my k , and for the formula I have accepted y = bxx. For my b I propose a different term from yours. -Since the initial size of an organ depends on b, I think "initial groth- index or initial index" would be quite suitable; I'd be glad to know what you think", etc. - February 19. Sends him the proposed draft, asking him to look it over, make suggestions and prepare the French version... A typed copy of Tissier's reply is enclosed, detailing the points raised in the previous letters.