Has observed the scarcity of humble-bees and subsequently of holly berries this year. But does not think humble-bees ever visit holly flowers, however plentiful they may be.
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The Charles Darwin Collection
The Darwin Correspondence Project is publishing letters written by and to the naturalist Charles Darwin (1809–1882). Complete transcripts of letters are being made available through the Project’s website (www.darwinproject.ac.uk) after publication in the ongoing print edition of The Correspondence of Charles Darwin (Cambridge University Press 1985–). Metadata and summaries of all known letters (c. 15,000) appear in Ɛpsilon, and the full texts of available letters can also be searched, with links to the full texts.
Has observed the scarcity of humble-bees and subsequently of holly berries this year. But does not think humble-bees ever visit holly flowers, however plentiful they may be.
Conducted crosses on Gladiolus varieties exactly according to CD’s letter. Flowers of same variety are self-sterile, whether from the same plant or not.
Provides evidence of self-sterility in Gladiolus.
Has observed three seed-leaves in some Dianthus seedlings.
Cannot cross, or grow from seed, Dielytra spectabilis.