SALIVAKY GLANDS. Ill 



of Nuck. Milne Edwards* refers in his work to Colin's 

 careful weighing of the different salivary glands, and justly 

 states that no general result can be deduced from the data 

 thus obtained. Colin found that the weight of the sub- 

 maxillary glands varied from 20 to 38 hundredths of the 

 weight of the parotids in the pig, horse, ass, the roebuck, 

 and dromedary, whereas in the cat it is 97 per cent., and in 

 the dog 108 per cent., but in the sheep this proportion at- 

 tained T Vb-fcH and in the ox, -Hrfths. The size of these 

 organs is probably not the only circumstance which influences 

 the degree of functional activity of these glands. In the pig, 

 ox, and sheep, the sublingual glands are sometimes double. 

 (Fig. 63), the one part emptying its secretion by a long 

 duct, and the other by a number of coiled ducts, well 

 seen in the annexed cutX Milne Edwards says that with the 

 salivary apparatus must be classed Jacobson's organ, which 

 is a long pouch on either side of the septum nasi, opening 

 behind the incisor teeth close to the incisive foramen. 



The quantity of saliva secreted is very considerable, and it is 

 not easy to estimate the average amount in different animals. 

 Jacubo witch obtained from a dog in one hour 49.19 gr. of 

 parotidean saliva, 38.94 of submaxillary saliva, and 24.84 gr. 

 of sublingual secretion. Colin opened the oesophagus to de- 

 termine how much saliva passed into the stomach of the 

 horse or ox. He obtained 4960 grs. of saliva per hour in a 

 small horse, whereas a large one yielded nearly 18 Ibs. weight. 

 He calculates the daily secretion to amount to 42 French 

 kilogrammes, or nearly 84 Ibs. In the ox the secretion is 

 more active, and would seem to attain 56 kilogrammes or 

 102 Ibs. 



In man it is commonly and justly stated that his '"mouth 



* Lecons sur la Physiologic et P Anatomic Comparte de F-ZTbmwn 

 ft des Animaux. Par H. MILNE EDWARDS. Victor Masson, 1861. 



