On Gravelly and Ccdadous Concretions. 207 



and how far these opinions may be confirmed by experi- 

 ments instituted for that purpose. 



And lirst, It is a matter of notoriety, that the period of 

 lite, from infancy to about fifteen inclusive, is most subject 

 to di.^orders of this kind. 



Of this practical observation we have an interesting con- 

 firmation inserted in the second volume of the Memoirs of 

 the French National Institute, Mathematical and Physical 

 Sciences, year 7- Under the former happy regime there 

 •was instituted, about forty years ago, at Luneville, in Lor- 

 raine, an hospital for the exclusive relief of calculous and 

 gravelly patients. In that interval, I6i29, of both sexes, 

 were admitted, and operated upon. Of these, 1564 were 

 males, and only 65 females. 



C. Saucerotte, an associate of the Institute, to whom 

 we are indebted for these interesting details, annexes tables 

 indicative of the number of these patients, that occurred at 

 the different periods of life, from the ag;e of one up to se- 

 venty-eight. To these, as too extensive to be inserted here, 

 I would beg leave to refer; and shall satisfy myself with 

 ^ome extracts only, expressive of the general result. 



A^e of Patients. , Number of Patients. 



Male Sex. 



1 year to 2 -' - 1 



2 years - - 14 



3 - - - 79 



4 - - - 131 



5 - - - 145 



6 - - - 147 



From this age, which afforded the maximum of the num- 

 ber of patients, we find a gradual declension, as follows : 



Age of Patients. Number of Patients. 



8 years - - - 121 



id - - - 79 



13 - - - 39 



'20 - - - 16 



25 - - - 7 



;?o - - - 8 



3b - _ - 4 



50 - - - 5 



<;o - - - £j 



70 - - . 2 



:s - - - 1 



Of 



