. Physiology, experimental and descriptive . ymph passes through many kernel-likemasses, the Lymphatic Glands. Lymph contains corpuscleswhich are considered identical with the colorless blood cor-puscles. It is thought that these corpuscles may be formedin the lymphatic glands. The flow of lymph is partly due to the blood pressure in thecapillaries; this pressure is caused by the heart. (In the frogthere are two small hearts, — not, however, near the blood-pumping heart, — and these pump the Lymph along.) In ourbodies the flow of lymph is largely aided by any pressure thatmay be brought to bea
. Physiology, experimental and descriptive . ymph passes through many kernel-likemasses, the Lymphatic Glands. Lymph contains corpuscleswhich are considered identical with the colorless blood cor-puscles. It is thought that these corpuscles may be formedin the lymphatic glands. The flow of lymph is partly due to the blood pressure in thecapillaries; this pressure is caused by the heart. (In the frogthere are two small hearts, — not, however, near the blood-pumping heart, — and these pump the Lymph along.) In ourbodies the flow of lymph is largely aided by any pressure thatmay be brought to bear on the lymph veins; for, on accountof the valves, as in the blood veins, any pressure must pushthe liquid toward the heart. Thus the action of the musclesin the limbs, and in the chest and abdomen, the movements of 100 BLOOD AND LYMPH. breathing, and in the bending of the body, etc., all help inthis flow, which is always, probably, very much slower thanthat in the blood veins. Left Jugular Vein Mouth ofLymph VeinLeft Subcla-^vian Vein. ...Right Lymph Vein 5^-^ Right Subclavian V\ Vein Precaval Vein Postcaval Vein Main Lymph Vein(Thoracic Duct) Lymph Capillaries Blood Capillaries Fig. 37. Diagram of the Circulation of Blood and Lymph. (Dorsal View.) BLOOD AND LYMPH. 101 Capillary MuscleFiber .CarbonDioxid Lymph is a clear liquid. (Chyle and the laeteals will beconsidered when we study digestion.) It is more watery thanthe blood plasma, but contains a share of all its nutritioussubstances. Lymph may be defined as diluted blood minusred corpuscles. The blood proper never reaches the cells of the tissues are bathed in the lymph which fillsthe spaces in the connective tissue (and we have seen that theconnective tissue pervades nearly all the tissues of the body), as water may fill the spacesLymPh left between stones built in- to a wall. The cells get alltheir nourishment from thelymph, and into the lymphthey throw all their wastematter. Each cell may becompared to
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