1. C. Darwin, The Origin of Species, 1859.“I have hitherto sometimes spoken as if the variations… were due to chance. This,of course, is a wholly incorrect expression, but it serves to acknowledge plainly our ignorance of thecause of each particular variation.… [The facts] leadto the conclusion that variability is generally related to the conditions of life to which each species hasbeen exposed during several successive generations.” Chap. V.
2. Mutations of bacteria from virus sensitivity to virus resistance;Luria;Genetics,1943
3. Heredity and variations in microorganisms;Delbrück;Cold Spring Harbor Symp. Quant. Biol.,1946
4. F. Jacob, The Logic of Life, A History of Heredity, Princeton University Press, Princeton, 1993.
5. A Feeling for The Organism: The Life and Work of Barbara McClintock;Keller,1983