3 Pages in Charles Darwin's Library associated with "physical conditions - exertion"

Elements of physiology
By: Müller, Johannes, - Baly, William,
Publication info: London, Taylor & Walton, 1838-1842
Volume: v.2
Pages: Page 931
The physiology or mechanism of blushing
By: Burgess, Thomas H. (Thomas Henry),
Publication info: London, John Churchill, 1839
Pages: Page 122
Wissenschaftliches System der Mimik und Physiognomik
By: Piderit, T.
Publication info: Detmold, Klingenberg, 1867
Pages: Page 79