. True manhood : a manual for young men . d organs of the are numerous glands, as the liver, pancreas,spleen and kidneys. Each one produces by means ofits cells a secretion pecuHar to itself. The secretionturned out by one gland is a bitter juice ; by anothersweet; by still another saltish, yet it is all taken fromthe blood. The nucleus of all gland cells is covered with anenvelope, and the protoplasm of some kinds is alsosurrounded by the same, while others are devoid ofcovering, and hence called membraneless. Glands are composed of cells inall stages of form-ation. The new young c
. True manhood : a manual for young men . d organs of the are numerous glands, as the liver, pancreas,spleen and kidneys. Each one produces by means ofits cells a secretion pecuHar to itself. The secretionturned out by one gland is a bitter juice ; by anothersweet; by still another saltish, yet it is all taken fromthe blood. The nucleus of all gland cells is covered with anenvelope, and the protoplasm of some kinds is alsosurrounded by the same, while others are devoid ofcovering, and hence called membraneless. Glands are composed of cells inall stages of form-ation. The new young cells, engaged in multipli-cation, are situated nearest the inclosing membrane ;then come the half-grown cells which have movedforward as they grew ; and finally the oldest andripest ones, full as they can hold, crowd upon theducts, their term of life completed, their work fin-ished. Their walls burst, and the cells are no moreforever. They pour into the duct, tipped out protoplasm(now called secretion) and broken envelopes in a heap (82). TRUE MANHOOD. g3 together. The next oldest cells then crowd iorwardand in their turn meet the same fate. The Salivary Glands. There are six of these placed in the flesh aroundthe mouth ; three on each side. Saliva is a colorless hquidwhich pours into the mouthand moistens the food while itis being chewed. Creative force residing insalivary cells chooses certainparticles from the blood(which is made from the food Fiff. XVII represents the (ells . ^ • ,^ of one gland -with the tube wc eat) as it courscs by m theplexus removed a7id the cells piexus, draws it into the body attached to the duct. ^ of the cell by osmosis andwith the help of the protoplasm manufactures it intoa new kind of juice—the sali-vary secretion or saliva. Thiscontains some constituentsfound nowhere else in thebody. When a boy begins to eathis dinner, he fills his mouth Fig. XVlII shows the plexuswith food ; sets his teeth into r;if;:;^:««7;S. the mouthful and masticates
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