TENDENCY TO CALCULOUS DISEASES. m 



Part II. — Of Urinary Concretions. 



When I proposed an examination of the urinary calculi belonging to the 

 Norfolk and Norwich Hospital, I had the expectation, that my attention would 

 have been materially circumscribed by the previous labours of Dr. Marcet, 

 who visited Norwich some years before, for the express purpose of examining 

 the collection. I found, however, that none of the calculi contained in it were 

 divided, and that the experiments instituted by our lamented colleague (of 

 which an account was published in his work on Calculous Diseases,) were 

 therefore necessarily confined to the outer surface, except in cases where the 

 calculus had been broken in the extraction, and its interior structure thus 

 allowed to be seen. 



Within the last four or five years, a certain portion of the calculi have 

 been divided ; and these, as well as such as were broken in the extraction, 

 amounting together to about 330, 1 have carefully analysed. 



I wish I could have extended the examination over the whole collection, 

 which consists of 649 specimens* ; but as there is no very speedy prospect of 

 the remainder being divided, so as to admit of a satisfactory analysis being 

 made of them, I am unwilling, longer, to defer laying before the Society tlie 

 results of my examinations, which exhibit a more extensive series of observations 

 in this part of pathological chemistry, than has yet, as far as I know, been pre- 

 sented from any cabinet in this country. I shall be happy in embracing a fu- 

 ture opportunity, of going through the whole remaining part of this splendid 

 collection, should the division of the residue be effected within a convenient 

 period. At the same time, however, it is not likely, that the proportions of the 

 different descriptions of calculi which form the remainder, will differ materially 

 from that of the large portion which I have analysed. — I have put the results 

 of the analysis in a tabular form ; and have stated, in the order of their occur- 

 rence from the centre, the consecutive deposits of the different materials of 

 which the calculi are composed, according to the most prominent character of 

 such material. I have said nothing of mixed calculi, or of calculi consisting, in 

 the same apparent deposit, of mixtures of diflferent ingredients ; because it is 



* This was the number up to the end of the year 1827. During the year 1828, there has been an 

 addition of 11 specimens to the collection, from the occurrence of that number of operations. 



