PHYSICAL AND UTERAnY. 333 



->. "We fee how fuddenly the whole bo- 

 dy fympathizes with the heart. 



4. As the arteries were almoft empty of 

 blood, and the little they contained was 

 in a flagnating ftate before the opium 

 was injeded into them, and the injedioa 

 was not pufned with fo much force as to 

 penetrate into the fmall veffels, and yet 

 its effeds were fimiiar to thofe of opium 

 applied to an intire animal ; it feems pro- 

 bable that opium, introduced by abforp- 

 tion, would ad chiefly, if not almoft fole- 

 ly, on the veflels conveying it ; and that 

 the rarefadion of the blood, faid to attend 

 the ufe of opium, is not to be confidered 

 withPitcairn, Friend, and with the learn- 

 ed Dr Tralles, as the primary effed of it, 

 but only as a fecondary one. 



S* Of the different fubftances compo- 

 ilng the fides of the larger arteries, we 

 can fuppofe the nerves alone capable of' 

 fuffering by the application of opium, fo 

 as to communicate that fufferance by 

 fympathy ; and therefore this experiment 

 feems to furnifh abundant proof, that the 



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