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From T. H. Farrer 19 June 1871
Summary
Observations on orchids. Ophrys apifera; confirms CD’s observation on pollinia. The nesting of ducks in trees is an example of change of instinct and habit.
| Author: | Thomas Henry Farrer, 1st baronet and 1st Baron Farrer |
| Addressee: | Charles Robert Darwin |
| Date: | 19 June 1871 |
| Classmark: | DAR 164: 69–70 |
| Letter no: | DCP-LETT-7826 |
