From:
Francis Darwin
To:
Charles Robert Darwin
Date:
[25 Aug 1873]
Source of text:
DAR 77: 142–3
Summary:
Regrets that "our brush theory" is wrong.
Contributor:
Darwin Correspondence Project
Regrets that "our brush theory" is wrong.
Experiments on Mimosa; effects of immersion.
Reports that grapes are spoiled by rain at vintage time and that damaged grapes, whose "bloom" is not intact, are particularly susceptible.
Comments on Expression. Suggests solutions to some of CD’s unresolved problems. Widens the "Principle of Association", whereby gestures associated with one emotion can also come to accompany a second emotion. Confirms the occurrence of blushing in the dark. Considers CD’s use of the "principle of Conservation of Force"; outlines its larger applications.
Fritz Müller is now working on the Brazilian honey-bees (Melipona and Trigona).
HM thanks CD for fertilisation references.