Second Letter to Mr. Tilloch on the Coto-Pock. \43 



!ast parcel he liad on the 2d of November last, which, to 

 use his own words, " though an useful tint, is not so fine a^ 

 that prepared two years aco." 



Permit me to add, though in this place it may be irrele- 

 vant, that I have jrencrally found good sulphate of copper 

 answer best this purpose; and as this salt, from its cheap- 

 ness, may possibly induce manufacturers to prefer it, tlie 

 prussiate of lime must give place to that of potash or some 

 other, since the former would form a simultaneous preci- 

 pitate of sulphate of lime and prussiate of copper. 



I remain, *ir. Yours, &:;c. 



Jos. Hume. 



XXIV. Second Letter to Mr. Tilioch on the Cow-Poch^ 

 from Dr. 'I'horntox, heing a Comparison of the Cou- 

 Pox iv'Uh the Small-Pox. 



Description of the natural Small-Pox, and of its Mortality. 



J. HERE Is no disease that the medical writer has to describe, 

 which presents a more melancholy scene than the natural 

 3mall-pox, as it very frequently occurs. 



When the phvsician is first called to the bed-side of the 

 patient, he is enabled at once to form a probable conjecture, 

 as to the approaching disorder, from the frequent sighings 

 and sobbings of the person labouring under an anxiety he 

 is unable to express ; by pains felt in the region of the 

 stomach, with an inclination, but generally an inability, to 

 vomit ; by the racking and frequent shooting pains along 

 the back and loins ; a general lassitude and aching of every 

 limb; a most unpleasant sensation of cold, not relieved 

 by any external warmth ; a continued drowsiness, and dis- 

 inclination to take food. 



Then succeed heat, thirst, an inflamed eye, restlessness, 

 or a constant inquietude ; the pulse is quick and hard ; 

 convulsions now come on in children, and violent sweating 

 in aduhs. 



Such arc the symptoms which usher in this dreadful foe 

 to the human race, which now manifests itself by many 

 speck-like spots, i-csembling Hea-bites, which appear first on 

 the face and upper parts of the body, and afterwards invade 

 tlie whole trunk, look angry, create pain, and gradually 

 elevate themselves abo\e the skin, taking on the appearance 

 of pimples. By the filth os sixth day, these are converted 

 3 into 



