To L. C. Wedgwood 8 June [1867–72]1
My dear Lucy
I hear that your Dog is a barker: please observe for me whether the (upper) lips are at all retracted or everted when he barks & just before he barks. My impression is that if you open a dog’s mouth lips almost hide teeth; but that they are much more exposed, when he barks, which implies some contraction or eversion.
You are so good an observer that I know I can trust your conclusion. The Bark ought not to be a savage one, as that wd give tendency to snarl— a joyful bark or bark of good spirits wd. be best.—2
Think of any fact about expression of any emotion in any of your birds.—3
Yours affect. | C. Darwin
Our Polly4 will not bark except as she rushes away to some supposed enemy in forest.
Asks her to observe whether her dog exposes his teeth when barking and to think of any facts about expression in her birds.
Please cite as
Darwin Correspondence Project, “Letter no. 7223,” accessed on 26 February 2017, http://www.darwinproject.ac.uk/DCP-LETT-7223