«20fl ANALYSIS OF A PULMONARY CALCULU9. 



was depofitcd in the mufeum of the Royal College of Surgeons 

 in Ireland, It was irregularly fpheroidal and meafured about 

 6| inches in circumference. It appeared to be formed of fhort 

 thick branches, proceeding from a folid center ; its fracture 

 was laminated, of a pure white colour, fmall communicating 

 canals appeared to interfect its fubftance in every direction *« 

 The faw cuts it with difficulty ; 10 grains afforded an 

 analyfis. 



grs. 

 It wns carbonate 3.7 carbonic acid. 



4.5 lime. 



1 .8 albumen and water. 



of lime. 



10.0. 



The analyfis. I fliall not trefpafs on your time by detailing the procefs of 



fo fimple an analyfis, fuffice it to fay, that it diffolved with 

 effervefcence in the fulphuric, nitric, muriatic, and acetic 

 acids, leaving fome floculi of coagulated animal matter (pro- 

 bably albumen) floating in the liquor of folution, the gas 

 which was extricated precipitated lime from lime water, and 

 the quantity of carbonic acid was afcertained, by adding a 

 known quantity of muriatic acid to a certain quantity of the 

 calculus, and taking the lofs after effervefcence for the weight 

 of the carbonic acid which was extricated. A portion of the 

 calculus expofed to a low heat affumed a blackith hue, but 

 when fubjedted to a white heat for 20 minutes, it became of 

 a brilliant white colour. The refidium was found to confifl 



Other calculi of pure lime. Morgani Epift. 17 to 19 upon the fubject of 

 pulmonary calculi, fays, that he has feen many of thefe fub- 

 itances coughed up, that they were light and porous like 

 pumice ftone, and varied from the fize of a millet-feed, to 

 that of a pea ; but he once faw a calculus which had been taken 

 from the lungs of a perfon who had died of Thifis Pul- 

 monalis, which weighed 20 grains, was " hard and heavy 

 like marble." Dodenius faw a pulmonary calculus taken after 

 death from the lungs of a nobleman, which affected the fhape 

 of the bronchia?, having fhort thick branches proceeding 

 from it, and canals which interfered it in every direction. 

 Morton faw fmooth cretaceous ftones taken from the lungs, 

 Morgani Epift. XV. 23. 



* Apparently formed by the depofition of calculous matter upon 

 the bronchial veffels. 



refcred to. 



