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Instructions on measuring pollen of dimorphic plants.
Thanks WED for measuring cowslip pollen. Sends dimorphic flowers.
Experiment instructions.
Discusses WED’s observations on polymorphic flowers.
Describes difference between Pulmonaria flowers; wishes to know whether it is general.
Writes of dimorphic plants.
Mentions WED’s extraordinary discovery of some pollen-grains of different sizes. The observations must be followed up.
CD wants WED to make some measurements on mid-styled [Primula sinensis] plants.
CD would like to see Rhamnus, as an American species is dimorphic.
Sends red cowslip pollen to be measured.
CD says Meneanthes is now in flower.
CD much obliged for specimen and drawings.