Darwin-Hooker Letters : Letter from Hooker, J. D. to Darwin, C. R. on 6–9 June 1855 : 90r
'Hooker, J. D.'
Finds Forbes's continental theories, migration, and double creation are all unsatisfactory explanations of geographical distribution of plants. Is currently working on problems of sea transport of plant species. European plants on Australian Alps only explicable by double creations.