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I n the fall of 1914 the writer undertook the study of the origin and development of the lymphatic system in the common rat.Before the work had proceeded very far it was evident that a knowledge of the adult anatomy would be of no small amount of help in guiding and interpreting the work on the origin and development of this system.So the plan was changed to a
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Thesle T. Job (1915) studied this question.
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