Serous Glands of a Rabbit
Serous glands. Labels: a, rabbit's pancreas "loaded" (resting); c, "discharged" (active) (observed in the living animal). b, loaded; d, discharged, alveolus of parotis (fresh preparation).
Martin, H. Newell The Human Body: A Text-book of Anatomy, Physiology and Hygiene (New York: Henry Holt and Company, 1900) 295
Courtesy the private collection of Roy Winkelman