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JDH writes to Sir William Turner Thiselton-Dyer regarding the delineation of the genera Callitris, Widdringtonia alias Pachylepis & Tetraclinis. He regards them as three distinct genera especially on reflection that they are from distinct geographic areas: Australia, South Africa & north Africa respectively. In a post script JDH adds that his work on grasses, including Indian species, is complicated by [Otto] Stapf's work on African grasses & will require JDH to make alterations as he goes.
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About Entomology. Describing is not of special use to the philosophical generaliser, but collecting, naming and classifying are most essential. He had described very little - except palms, when he wrote his papers on variation- but very experienced in these other areas. Errors of Galton and Bateson are due to want of such training. Description of trip to Switzerland with Mitten in the summer. Will's work with Mr Holmes.