The laws and mechanics of circulation, with the principle involved in animal movement . n the mesentery of the guinea-pig ex-pand and contract regularly and rhythmically. Then, again,the veins contract for pushing the blood toward the heartand lungs, and no reason presents why the lymphatics maynot do likewise; seeing, also, that they connect with thevaso-motor and respiratory centres, the same as the bloodvascular system. Finally, the great difficulty in circulatinglymph, by reason of the glands intercepting the stream, wouldaccount for the strength of the vessels, or the number of mus-cles,
The laws and mechanics of circulation, with the principle involved in animal movement . n the mesentery of the guinea-pig ex-pand and contract regularly and rhythmically. Then, again,the veins contract for pushing the blood toward the heartand lungs, and no reason presents why the lymphatics maynot do likewise; seeing, also, that they connect with thevaso-motor and respiratory centres, the same as the bloodvascular system. Finally, the great difficulty in circulatinglymph, by reason of the glands intercepting the stream, wouldaccount for the strength of the vessels, or the number of mus-cles, elastic and fibrous tissue in the walls of the vessels. Justhere it were well to give some idea of the anatomy in the * CM. Med. 1869. p. 545. 250 PHYSIOLOGICAL ANATOMY. glands to show the difficulties which beset the way, and thenecessity for this increase of force for compelling circulationin the measure of the requirements. In the first place, theglands are composed of a congeries of lymph-nodes communi-cating with afferent and efferent vessels (Fig. 93,/,/, h). J he i—\. Fig. 93.—Section of a Small Lymphatic Gland, half diagrammatically given, with thecourse of the lymph, a, The envelope ; b, septa between the follicles or alveoli ofthe cortical portion ; c, system of septa of the medullary portion, down to the hilusof the organ ; e, lymph-tubes of the medullary mass ; /, different lymphatic streamswhich surround the follicles, and flow through the interstices of the medullary por-tion ; g, confluence of these passing through the efferent vessel ; h, at the hilus ofthe organ —Frey.
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