1. Pasteur, L., 1864, quoted in www.http//en.wikipedia.org/wiki/Biogenesis.
2. On the Origin of the Species;Darwin,1859
3. Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid
4. Darwin, C., letter to Joseph D. Hooker, March 29, 1863.
5. Op. Cit. 1, the Athenæum, www.darwinproject.ac.uk/[Letter 4108], 1863.