250 PRACTICE OF PHYSIC. 



tions of persons who have died of it, it is probable that all the 

 exanthemata may occasion a phthisis, by affording a matter 

 which, in the first place, produces tubercles. 



DCCCLXXXI. Another acrimony which seems sometimes 

 to produce phthisis, is the syphilitic ; but whether such an acri- 

 mony produces phthisis in any other persons than the pre- 

 viously disposed, does not appear to me certain. 



DCCCLXXXII. What other species of acrimony, such as 

 from scurvy, from pus absorbed from other parts of the body, 

 from suppressed eruptions, or from other sources, may also pro- 

 duce tubercles and phthisis, I cannot now decide, but must 

 leave to be determined by those who have had experience of 

 such cases. 



DCCCLXXXIII. There is one peculiar case of phthisis, 

 which, from my own experience, I can take notice of. This is 

 the case of phthisis from a calcareous matter formed in the 

 lungs, and coughed up, frequently with a little blood, some- 

 times with mucus only, and sometimes with pus. How this 

 matter is generated, or in what precise part of the lungs it is 

 seated, I acknowledge myself ignorant. In three cases of this 

 kind which have occurred to me, there was at the same time no 

 appearance of stony or earthy concretions in any other part of 

 the body. In one of these cases an exquisitely formed phthisis 

 came on, and proved mortal ; while in the other two, the symp- 

 toms of phthisis were never fully formed ; and after some time, 

 merely by a milk diet, and avoiding irritation, the patients en- 

 tirely recovered. 



DCCCLXXXIV. Another foundation for phthisis, anala- 

 gous, as I judge, to that of tubercles, is that which occurs to 

 certain artificers, whose employments keep them almost con- 

 stantly exposed to dust such as stone-cutters, millers, flax- 

 dressers, and some others. I have not observed in this country 

 many instances of phthisis which could be referred to this cause ; 

 but from Ramazzini, Morgagni, and some other writers, we 

 must conclude such cases to be more frequent in the southern 

 parts of Europe. 



DCCCLXXXV. Besides those now mentioned, there are 

 probably some other causes producing tubercles, which have not 

 yet been ascertained by observation ; and it is likely, that in 



