Encloses strawberry blossoms used in his crossing experiments.
Encloses strawberry blossoms used in his crossing experiments.
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.
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].
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.
No summary available.
No summary available.
No summary available.
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.
No summary available.