OF MASTICATION AND DEGLUTITION. XJ'H 



342. The saliva flows from three orders of conglome- 

 . rate glands, placed laterally and interiorally with respect 



to the lower jaw. 

 The principal are the parotids* which pour forth 



the saliva behind the middle molares of the upper jaw, 



through the Stenonian ducts.f 

 The submaxillary,^ through the \Vhartonian. 

 The sublingual, \\ the smallest, through the numerous 



JRivinian.** 



343. The excretion of saliva, amounting, according 

 to the arbitrary statement of Nuck,ff to a pound in 

 twelve hours, is augmented by stimuli and by mecha- 

 nical pressure, or, if the expression may be allowed, 

 emulsion. 



The latter cause, greatly favoured by the situation 

 of the parotids, at the articulation of the jaws, occurs 

 when Ave chew hard substances, which thus become 

 softened. 



, The former occurs when acrid substances are taken 

 into the mouth, which are thus properly diluted ; or 

 arises from imagination, (288) as when the mouth waters 

 during the desire for food. 



344. The mucus of the labial and buccal glands j; 

 and of the tongue, as well as the moisture which trans- 



* De Courccllc, Icunes Mitsculorum Cnpitis. Tab. I. tr. ft. 



f- Stenonis, Obserrationes Anatomical, p. 20. 



I De Courcelles, 1. c. Tab. n. 1. 1. 



Wharton, Adenographia. p. 120. 



i| De Courcelle, tab. v. g. g. g. 



** Rivinus, 2)e Dyspepsia. Lips. 1678. 4tO. 



Aug. Fr. Walthcr, De Lin gua Hitmana. ib. 1721. -Ito. 



ft Nuck, Sialogrnphia. p. 29 sq. 



+1 DC Ccurccllc?, 1. c. Tab. iv. c. <. e. 



