Zi? ©F THE SALIVA Sect. XXIV. k 



S E C T. XXIV. 



OF THE SECRETIONS OF SALIVA, AND OF TEARS, ANP OF TH£ 



LACRYMAL SACK. 



I. Secretion of faliva increafed by mercury in the Hood. I. By the 



focd in the mouth. Drynejs of the mcuth not from a deficiency of 



faliva. 2. By fenfative ictecs. 3. By volition. ' 4. By diflafle- 



ful fubjlances. It is fee ret ed in a dilute and j aline fate. It then 



becomes more vifcid. t;. By idea. \ftaftefut fubjlances. 6. 



By naufea. 7. By Qverfioq.' 8- By catenation with Jiimulating 



fubjlances in the ear. II. i. Secretion of tears lefs in flee p. 



J* ram jlimulation of their excretory duct. 2. Lacrymal fark is a 



gland. 3. Its ufes. 4. Tears are fee ret ed, when the nafal duel 



is Jlimulated. 5. Or when it is excited by fenjation. 6. Or by 



volition* 7. The lacrymal Jack can regurgitate its contents into 



the eye. 8. More tears are fecreted by affectation with the irri* 



taiicn of the nafal duel of the lacrymal Jack, than the puntla lacry-* 



tnalia can imbibe* Of the gout in the liver andfiomach, 



I. The falival glands drink up a certain fluid from the cir- 

 cumfluent blood, and pour it into the mouth. They are fome- 

 times (limulated into action by the blood, that furrounds their 

 origin, or by fome part of that heterogeneous fluid : for when 

 mercurial fairs, or oxydes, are mixed with the blood, they itim- 

 ulatethefe glands into unnatural exertions ; and then an unufuai 

 quantity of faliva is feparated. 



1. As the faliva fecreted by thefe glands is molt wanted during 

 the maftication of our food, it happens, when the terminations* 

 of their duels in the mouth are ichhulated into action, the fali- 

 val glands themfelves are brought into increafed action at the 

 fame time by aflbciation, andfeparate a greater quantity of their 

 juices from the blood ; in the fame manner as tears are produ- 

 ced in greater abundance during the ftimulus of the vapour of 

 onions, or of any other acrid material in the eye. 



The faliva is thus naturally poured into the mouth only du- 

 ring the tlimulus of our loodin mafticaticn 5 for when there is 

 too great an exhalation of the mucilaginous fecretion from the 

 membranes, which line the mouth, or too great an absorption of 

 it, the mouth becomes dry, though there is no deficiency in the 

 quantity of faliva ; as in thole who fleep with their moutl^ 

 open, and in fome fevers.' 



2. Though during the maftication of our natural food the fa- 

 Jivul glands are excited into aclion by the Tumulus on their ex- 

 cretory 



