SECT. XXXII. 9. DISEASES OF IRRITATION 439 



cold. The trembling in confequence of the pain 

 of coldnefs, the reftleflhefs, and the yawning, and 

 ftretching of the limbs, together with the Ihud- 

 dering, or rigours, are convuliive motions ; and 

 will be explained amongft the difeafes of voli- 

 tion ; Sea. XXXIV. , 



Sicknefs and vomiting is a frequent fymptom 

 in the beginnings of fever-fits, the mufcular fibres 

 of the ftomach fhare the general torpor and debi- 

 lity of the fyftem ; their motions become firft 

 leffened, and then flop, and then become retro- 

 grade ; for the acl of vomiting, like the globus 

 hyftericus and the borborigmi of hypochondriacs, 

 is always a fymptom of debility, either from want 

 of ftimulus, as in hunger ; or from want of fen- 

 forial power, as af er intoxication ; or from fym- 

 pathy with fome other torpid irritative motions, 

 as in the cold fits of ague. See Sect. XII. 5. 5. 

 XXIX. 11. and XXXV. i. 3. where this aft of vo- 

 miting is further explained. 



The fmall pulfe, which is faid by fome writers 

 to be flow at the commencement of ague-fits, and 

 which is frequently trembling and intermittent, is 

 owing to the quiefcence of the heart and arterial 

 fyftem, and to the refiftance oppofed to the cir- 

 culating fluid from the inactivity of all the glands 

 and capillaries. The great weaknefs and inability 

 to voluntary motions, with the infenfibility of the 

 extremities, are owing to the general quiefcence 

 of the whole moving fyftem ; or perhaps, fimpiy 

 to the deficient production of fenforlal power. 



If all thefe fymptoms are further increafed, 

 the quiefcence of all the mufcles, including the 

 heart and arteries, becomes complete, and death 

 enfues. This is, moft probably, the cafe of thofe 

 who are ftarved to death with cold, and of thofe 

 who are faid to die in Holland from long fkaiting 

 on their frozen canals. 



2. As 



