Class II. i. i. 4. OF SENSATION. 153 



them, into too great action, and might thence injure the fenfe 

 of fmell which is diffbfed on it. 



In this operation the too great action of the velTels of the 

 membrane of the noilrils is the remote caufe \ the fen fat ion 

 thence induced is the proximate caufe j and the muicular ac- 

 tions are the proximate effect. 



This action of fneeztng frequently precedes common refpira- 

 tion in new-born children, but I believe not always , as like the 

 latter it cannot have been previoufly acquired in the uterus. 



It is produced in fome people by iudden light, as by locking 

 up at the iky in a morning, when they come out of a gloomy 

 bed-chamber. It then becomes an ailhciate action, and belongs' 

 to Oafs IV. 1. 2. 2. 



M. M. When it is exerted to excels it may be cured by 

 fnuffing ftarch up the noilrils. See Clafs I. 1. 2. 13. 



4. Anhelitus. Panting. The quick and laborious breathing 

 of running people, who are not accuftomed to violent exercife, 

 is occasioned by the too great conflux of blood to the lungs. As 

 the fanguiferous fyftem, as well as the abforbent fyitem, is fur- 

 nifhed in many parts of its courie with valves, which iri general 

 prevent the retrograde movement of their contained fluids ; and 

 as all thefe vefiels, in fome part of their courie, lie in contact 

 with the mufcles, which are brought into action in running, it 

 follows that the blood mud be accelerated by the intermitted 

 fwellirtg of the bellies of the mufcles moving over them. 



The difficulty of breathing", with which very fat peOftle are 

 immediately affected on exercifej is owing to the prefTure of the 

 accumulated fat on the veins, arteries, and lymphatics ; and 

 which, by diftending the (kin, occafions it to act as a tight ban- 

 dage on the whole iurface of the body. Hence when the muf- 

 cles are excited into quicker action, theprogrefs of the blood in 

 the veins, and of the lymph and chyle in the abfofbent fyitem, 

 is urged on with much greater force, as under an artificial ban- 

 dage on a limb, explained in Art. IV. 2. 10. and in Sect. 

 XXXIII. 3. 2. Hence the circulation is inltantly quickened to 

 a great degree, and the difficulty of breathing is the confequence; 

 of a more rapid circulation through the lungs. The increafed 

 fecretion of the perfpirable matter is another confequence 

 this rapid circulation ; fat people, when at reft, are believed toper* 

 fpire lets than others, which may be gathered from their generally 

 having more liqui< more and paler urine, and to th 



frequently taking lets food than many thin people ; and laftl*, 

 from the perfpiration of fat people being generally more inodo- 

 rous than that of lean ones ; but when corpulent people are put 

 in motion, the fwe'at (lands in drops on their fkifld, and they 



Vol. II. W **i«id 



