. Physiology, experimental and descriptive . 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 an individualameba, which lives in water,and takes all its nourish-ment from that water, andthrows all its waste producti
. Physiology, experimental and descriptive . 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 an individualameba, which lives in water,and takes all its nourish-ment from that water, andthrows all its waste productinto the same water. Aswater is the medium irwhich the ameba lives, sowe may say lymph is themedium in which the cellsof the body live. The cells of the body,, all the active, workingcells, may, therefore, be said to live an aquatic life, and onlydead cells, as of hair, epidermis, etc., are in air. We mightalso say that not only the human body, but all animal life,is aquatic. We can see that the movement and renewal of the lymph Oxygen. OtherWastes Fig. 38. Relation of Blood and Muscle.(Lymph being middleman.) 102 THE SPLEEN. is as necessary as the circulation of the blood itself; is, infact, the most important part of it. We have noticed the pericardial liquid. There is also asmall quantity of similar liquid around the lungs in the pleu-ral cavities, and in the abdominal or Peritoneal Cavity, aroundthe digestive organs ; also in the cavities of the brain. Theliquid in each case is lymph; and these cavities, often calledSerous Cavities, are Lymph Cavities. They communicate withthe lymph tubes. In health the amount ©f the liquid in thesecavities is small, but in certain disorders it may general, such affections are called dropsy. The lymphmay also accumulate in the tissues of the extremities, causingswelling of the limbs. It is evident that the materials needed by the cells of thedifferent tissues are not the same. So, as one tissue takescertain materials and a
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