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Experimental inquiries: Part the third. Containing a description of the red particles of the blood in the human subject and in other animals; with an account of the structure and offices of the lymphatic glands, of the thymus gland, and of the spleen: being the remaining part of the observations and experiments of the late Mr. William Hewson / [Edited] By Magnus Falconar. Public Domain Mark. Source: Wellcome Collection.