280 



PHYSIOLOGY OF THE DOMESTIC ANIMALS. 



side by side, near to the ramus of the jaw, to enter the mouth, the submaxillary 

 duct being somewhat the larger and lying nearer the jaw ; the ducts are crossed 

 by the lingual nerve. Either duct may then be isolated or divided and treated as 

 in making a permanent parotid fistula (Figs. 115 and 116). In the horse, rumi- 

 nants, and rabbits the operative procedure is about the same as in the dog 

 (Fig. 117). 



The submaxillary saliva obtained by catheterization or from fistulse 



is a limpid, viscid fluid of alkaline 

 reaction. Its density is said to be 

 greater than that of the -parotid or 

 mixed saliva, and may rise to 1025 

 after feeding. According to Eck- 

 hard, the submaxillary saliva be- 

 comes more consistent when exposed 

 to the air, and will precipitate a 

 flocculent deposit. Corrosive sub- 

 limate causes it to become almost 

 gelatinous without becoming turbid. 

 It contains a considerable quantity 

 of mucin, to which this viscidity is 

 due. Albumen seems to be almost 

 absent from the submaxillary saliva, 

 or to be present only in traces, 

 although the xanthoproteic reac- 

 tion will demonstrate the presence 

 of proteids. The diastatic power 

 of the submaxillary saliva of the 

 dog appears to be but slightly de- 

 veloped in the fresh saliva, although 

 it acquires this property by stand- 

 ing one or two days in the atmos- 

 phere. The following tables, after 

 Lassaigne and Herter, represent the analysis of this secretion— 



Kig. 116.— Anatomy of the Submaxil- 

 lary and Sublingual Glandular 

 Region in the Dog. (Bernard.) 



a a, digastric muscle; b b, mylo-hyoid muscle; 

 c c, sublingual gland ; cl. sublingual duct ; e, submax- 

 illary duct; f g, submaxillary gland; 1, lingual nerve; 

 2, chorda tympani. 



In the Hoi'i 



Water, 

 Solids, 



Salts, 



Organic matter, 



In the Cow. 

 Water, 



Mucin and albuminous matter, 

 Alkaline carbonates, 

 Alkaline chlorides, 

 Alkaline phosphates, 

 Phosphate of lime, 



992.5 



7.5 



2.575 



4.925 



991.14 



3.53 



0.10 



5.02 



0.15 



0.06 



