Sends JDH part of MS for chapter 3 of Natural selection ["Possibility of all organic beings crossing"] to be corrected and returned.
JDH’s report of Podostemon flowering cleistogamously under water in Bengal.
[Copious revision by JDH.]
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Sends JDH part of MS for chapter 3 of Natural selection ["Possibility of all organic beings crossing"] to be corrected and returned.
JDH’s report of Podostemon flowering cleistogamously under water in Bengal.
[Copious revision by JDH.]
Questions JDH on separation of sexes in trees in New Zealand flora.
CD is convinced of relation between separation of sexes and tree-habit.
Recent hard blows against crossing theory.
CD long tormented by land molluscs on oceanic islands; found transport possible experimentally.
On the variety of species definitions prevalent among naturalists.
Podostemaceae flowering under water.
Has done New Zealand flora calculations. Results support CD’s theory of necessity of crossing. Trees tend to have separate sexes.