. Human physiology. ch, and becomes filled with fluid; this gradually extends and becomes so Fig. 134. large that the cytoblast appears like a small body within its walls, and • © 0 ^ hence the cell is said to be nucleated. The form of the cells is at first irre- p-nlnr tliPTi mnrp rpo-nlqr qnrl thpv PI representing the formation of a Nu- guiar, tneu more regular, ana iney ^j^^^^ ^^^ ^^ ^ ^^^^ ^^ ^^^ Nucleus, ac-are alternately flattened by pressure cording to Schieideus view,against each other, so as to assume different forms in different tissues. Such is the description of Schwannand Schleid
. Human physiology. ch, and becomes filled with fluid; this gradually extends and becomes so Fig. 134. large that the cytoblast appears like a small body within its walls, and • © 0 ^ hence the cell is said to be nucleated. The form of the cells is at first irre- p-nlnr tliPTi mnrp rpo-nlqr qnrl thpv PI representing the formation of a Nu- guiar, tneu more regular, ana iney ^j^^^^ ^^^ ^^ ^ ^^^^ ^^ ^^^ Nucleus, ac-are alternately flattened by pressure cording to Schieideus view,against each other, so as to assume different forms in different tissues. Such is the description of Schwannand Schleiden of the vegetable cells from which all the tissues of Op. citat., § 126. * Mikroskopische Untersuchungen iiber die TJebereinstimmuiig in der Struktur unddem Wachstum der Thiere und Ptlanzen, von Dr. Th. Schwann und Dr. Schleiden, inMiillers Archiv., p. 137, 1838 ; and Microscopical Researches into the Accordance andGrowth of Animals and Plants, translated by Henry Smith, Sydenham Societys edition,London, 464 NUTRITION. plants take their origin. In like manner, the tissues of animals areformed from a fluid, in which nncleoli, nvclei or cytohlasts—and cells,are successively developed. The globules of lymph, pus, and mucus,are cells with their walls distinct and isolated from each other; hornytissues are cells with distinct walls, but united into coherent tissues;bone, cartilage, &c., are formed of cells whose walls have coalesced;areolar tissue, tendon, &c., are cells which have split into fibres; andmuscles, nerves, and capillary vessels are cells whose walls and cavi-ties have coalesced. These cells seem to possess an independent and limited life, whichhas no immediate connexion with that of the organism; the decompo-sition constantly taking place in the living body being connected withthe death of the cells of which the several parts are constructed; andfor the reintroduction of which into the circulating fluid, the lymphaticsystem appears to be specially destin
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