ANALYSIS OP A PULMONARY CALCULUS. 205 



It would alfo be eafy to make it into a true lock of com- And alfo ex- 

 bination ; by making each of the circular pieces to confift of combinations. 

 two equal pieces, locking into each other by contrate teeth, 

 and fcrewed together by a nut. And if one of thefe pieces 

 were permanently fixed to the axis, and the other were to 

 carry the edge-teeth, and notch, as mentioned in the laft . 



paragraph, the lock would not only be fecure from opening 

 by the method I ufed ; but it would" alfo be in the choice of 

 the pofTeflTor to vary the fecret of the portions by unfcrewing 

 the nut, and changing the application of the contrate teeth, 

 after which he would fecure them together as before. 



XI. 



Andy fis of a Pulmonary Calculus, by Philip Crampton, 

 M. D. Member of the Royal College of Surgeons in Ireland. 

 Communicated by the Honourable George Knox. 

 F. R. S. M. R. I. A. %c *. 



ME apology feems necefTary for offering the analyfis of a Difficulty of ob- 

 fingle pulmonary concretion, but the difficulty of procuring tam »ng puimo- 

 thofe fubftances, and the importance of every facl, however 

 infulated, which relates to the changes that take place in the 

 bodies of living animals mutt plead my excufe. 



I have no where been able to find a detailed analyfis of They have not 

 pulmonary calculi ; Mr. Fourcroy mentions them in a general been examined, 

 way, as being fimilar to lachrymal, pineal and fali vary con- 

 cretions, all of which he fays are compofed, as might be ex* 

 peeled a-priori, of phofphate of lime (either from a fuper* 

 abundance of that fubftance in the fluids of furfaces, or in the 

 blood) 



But as the calculus in queftion neither agrees with any of 

 thofe in its external characters, nor in its chemical compofi- 

 tion, without in the lead calling in queftion the accuracy of 

 Mr. Fourcroy, I fhall briefly ftate the refult of my own ex- 

 amination of it. 



The calculus which is the fubject of this paper, was taken Defcriptlon an<J 



from the lungs of a deceafed foldier, in the year 1796, and niftor y °f a 



pulmonary cal- 

 culus. 

 * Read before the Royal Society in Auguft 1802. 



2 was 



