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“Diagram to show the working parts of a gland. v and a are blood tubes with thin-walled branches around the parts of the gland c. These take material from the blood and, after changing it, send it to the mouth, stomach, or other places before the duct i.” —Davison, 1910


Alvin Davison, Health Lessons (New York: American Book Company, 1910) 42


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