. The anatomy of the human body. Human anatomy; Anatomy. PREPARATION OF THE LYMPHATIC VESSELS AND GLANDS. 617 Their size varies from that of a millet seed to that of a large filbert. The smallest are situated in the epiploon, the largest at the roots of the lungs. They are often greatly enlarged by disease. They are generally of a reddish-gray colour, excepting at the root of the lungs, when they are black. Their form is irregularly spheroidal; and they have been distinctly shown by Malpighi to have a cellular structure.* If we examine with a lens a lymphatic gland distended with fluid, we obs
. The anatomy of the human body. Human anatomy; Anatomy. PREPARATION OF THE LYMPHATIC VESSELS AND GLANDS. 617 Their size varies from that of a millet seed to that of a large filbert. The smallest are situated in the epiploon, the largest at the roots of the lungs. They are often greatly enlarged by disease. They are generally of a reddish-gray colour, excepting at the root of the lungs, when they are black. Their form is irregularly spheroidal; and they have been distinctly shown by Malpighi to have a cellular structure.* If we examine with a lens a lymphatic gland distended with fluid, we observe that it contains cells ; the same fact is clearly demonstrated by injecting it with mercury, which shows, moreover, that the cells communicate freely with each other. It is, nevertheless, doubtful whether all the cells communicate. The researches which I have made upon this subject appear to show that each lymphatic vessel is connected with a distinct portion of the lymphatic gland ; and diseases of the glands establish the same fact, by attacking one part only of a gland, the rest continuing unaffected. Several lymphatic vessels enter each gland, and several emerge from it. Each affer- ent vessel (ffl a a, Jig. 225), as it reaches the circumference of the gland, divides into a considerable number of branches, which diverge and run for a short distance upon the surface of the gland, and then dip into its The efferent lymphatics {b b) commence in precisely the same manner as the afferent vessels terminate. The study of these vessels in the larger animals appears calcula- ted to clear up all doubts as to the structure of the lymphatic glands. Abernethy having injected the mesenteric arteries and veins of a whale, saw the fluid run into pouches about the size of an orange ; he then injected mercury into the lacteals, and found that it flowed into the same cavities; he therefore concluded that the arteries, veins, and lacteals all opened into the same cavities. Thi
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