Elements of pathological anatomy . reno cases of it on record. The ducts, both of the parotid and submaxillary glands, are sometimes theseat of calcareous concretions, which are named sali-vary calculi. Theirvolume varies from that of a clover-seed to that of a large almond : their number is usu- ,->• , on , .ally small. They are of a pale yellowish color, ovalin their shape, and have a finely tuberculated sur-face. Their composition is phosphate and carbonateof lime, agglutinated together by a small quantity ofanimal matter. A concretion of this description fromthe left submaxillary gland
Elements of pathological anatomy . reno cases of it on record. The ducts, both of the parotid and submaxillary glands, are sometimes theseat of calcareous concretions, which are named sali-vary calculi. Theirvolume varies from that of a clover-seed to that of a large almond : their number is usu- ,->• , on , .ally small. They are of a pale yellowish color, ovalin their shape, and have a finely tuberculated sur-face. Their composition is phosphate and carbonateof lime, agglutinated together by a small quantity ofanimal matter. A concretion of this description fromthe left submaxillary gland of a patient of Dr. T. ,of this city, is seen in Fig. 129 (b). It is re-presented of the natural size and shape. The principal disease of the sublingual gland is ranula, which is generallysupposed to depend upon the dilatation of one of its ducts, but is in reality anencysted tumor. The swelling is usually occupied by a thick, glairy fluidlike the white of eggs, but sometimes is watery, or of a pultaceous consistence :. 520 MOUTH. occasionally, it resembles the synovial liquor of the joints, and contains parti-cles of gritty matter, probably a mixture of phosphate and carbonate of lime. The size of the tumor varies from that of a pea to that of the list ; its form iflirregularly oval, and its parietes are thin, and lor the most part submaxillary gland is sometimes similarly affected. The saliva, the product of the glands, the diseases of which we have justbeen considering, is a transparent fluid like water, but much more viscid,without taste or smell, and of the specific gravity of 1*0061—1*0088. It isslightly alkaline but not acid, and consists of a peculiar body, termed ptyaline,in union with osmazome, admixture of mucus, sulpho-cyanogen, and earthysalts. The latter are, according to Mitscherlich : Chloride of potassium - - - 0*18 Potash, combined with lactic acid - - - 0-094 Soda ...... 0-024 Lactic acid - Soda, probably combined with mucus - -
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