Darwin-Hooker Letters : Letter from Darwin, C. R. to Hooker, J. D. on 13 Apr 1855 : 1r
'Darwin, C. R.'
Pea self-fertilisation: has forty-five varieties growing side by side. Describes seed-salting experiments: e.g., immersion in tank filled with snow. Reports some successful germinations. Made list of naturalised plants from Asa Gray's Manual of Botany to calculate the proportions of the great families.