Note 119 — Chapter VI
Reading edition
Darwinism To-day, p. 377, quoting H. F. Osborn’s The Unknown Factors of Evolution. Osborn, like the writer (see p. 90), holds Spencer and Weismann to be mutually destructive. “If acquired variations are transmitted there must be therefore some unknown principle in heredity; if they are not transmitted there must be some unknown factor in evolution.”