Darwin-Hooker Letters : Letter from Darwin, C. R. to Hooker, J. D. on 12 July 1860 : 1r
'Darwin, C. R.'
Floral anatomy; pistil curvature and pistil movement. Darwin's rule that bent pistils occur in 'gangway' into nectaries. The book Hooker is planning, which he and Darwin discussed at Kew, should deal with plant reproduction.