Letter from Howard Walter Florey to Cass Canfield, New York Thanks for letter about signing manifesto on population problems - had letter from Julian Huxley about this - statement contains categorical assertions for which he has no evidence - should prefer thoroughly documented evidence to be put before legislative bodies - past estimates of population trends not always accurate - does not wish to sign statement - more effort should be given to producing universally accepted method of birth control. 10 October 1960