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To Charles Turner   [1 April – 16 June 1863?]

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Summary

Asks correspondent whether, when growing hollyhocks, he finds it necessary to space out the different varieties to prevent crossing and thus to obtain true seed [see Variation 2: 108].

Author:  Charles Robert Darwin
Addressee:  Charles Turner
Date:  [1 Apr – 16 June 1863?]
Classmark:  DAR 96: 12
Letter no:  DCP-LETT-3886

From Richard Trevor Clarke   [April? 1863]

Summary

Encloses strawberry blossoms used in his crossing experiments.

Author:  Richard Trevor Clarke
Addressee:  Charles Robert Darwin
Date:  [Apr? 1863]
Classmark:  DAR 161: 164
Letter no:  DCP-LETT-4070

From James Anderson   1 April 1863

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Summary

Sends CD seeds of Cattleya crispa as requested [see Collected papers 2: 77–8].

Anticipates success for his attempts to cross orchids artificially. Has not had a single seed germinate from a pod that was not produced by artificial crossing.

Author:  James Anderson
Addressee:  Charles Robert Darwin
Date:  1 Apr 1863
Classmark:  DAR 159: 59
Letter no:  DCP-LETT-4071

From Arthur Rawson   1 April [1863]

Summary

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.

Author:  Arthur Rawson
Addressee:  Charles Robert Darwin
Date:  1 Apr [1863]
Classmark:  DAR 176: 22
Letter no:  DCP-LETT-4072

From John Scott   [1–11] April [1863]

Summary

Studying self-sterility, particularly in Oncidium, where abortion occurs consistently but stigma functions normally. His hybrid orchid crosses show sterility occurs capriciously. Thus it is not a "special endowment".

Disputes Asa Gray’s and Hermann Crüger’s view of rostellar germination.

Doubts absolute sterility of Catasetum.

Disappointed by results with homomorphic cowslips.

Author:  John Scott
Addressee:  Charles Robert Darwin
Date:  [1–11] Apr [1863]
Classmark:  DAR 108: 183, DAR 177: 86 (fragile)
Letter no:  DCP-LETT-4073