6 Pages in Charles Darwin's Library associated with "physical conditions - sexual arousal"

Elements of physiology.
By: Müller, Johannes. - Baly, W.
Publication info: London :Taylor & Walton,1838-1842.
Volume: v.1
Pages: Page 698 Page 928 Page 1318 Page 1482
Naturgeschichte der Saeugethiere von Paraguay.
By: Rengger, Johann Rudolph.
Publication info: Basel :Schweighauser,1830.
Pages: Page 48
Wissenschaftliches System der Mimik und Physiognomik.
By: Piderit, T.
Publication info: Detmold :Klingenberg,1867.
Pages: Page 58