8^ DR. YELLOLY'S REMARKS ON THE 



that in every instance of urinary concretion wbich came under his observation, 

 he found carbonate of lime, when there was phosphate*. 



In one or two calculi of mixed phosphates which are in Dr. Prout's posses- 

 sion we found carbonate of lime ; and the courtesy of Sir William Blizard, 

 the chairman of the Board of Curators of the Hunterian Museum, gave me the 

 opportunity of making the same observation, in some of the specimens con- 

 tained in that noble collection. I likewise had the particular favour from Dr. 

 Benjamin Babington, of not only examining with him, with the same result, 

 several calculi of his small but valuable collection, (many of which are dupli- 

 cates of those in the museum of Guy's Hospital,) but of being permitted the 

 loan, and full use of his cabinet, which gave me the important opportunity, of 

 instituting more ample experiments, than were at all admissible with the calculi 

 belonging to the Norfolk and Norwich Hospital, where it was of course neces- 

 sary to be limited to the smallest portion requisite for correct analysis. 



I have likewise always found carbonate of lime in combination with phos- 

 phate, both in concretions formed in various parts of the body, and in prostatic 

 calculi, (one of which I examined at the College of Surgeons,) although both 

 sets of substances are generally regarded as consisting of phosphate of lime 

 alone. The same observation has been made by Dr. Prout, as to several 

 similar substances which have come under his notice. 



No specimen of cystic or xanthic oxide has yet been found in the Norwich 

 collection. 



The calculations which are comprised in this paper, can in many instances, 

 only be regarded as approximating to the truth ; and as depending on future, 

 and more extended observation, for greater accuracy and precision. The in- 

 quiring disposition of the present age, has made us acquainted with the phy- 

 sical features of the principal parts of the united kingdom, whether in relation 

 to power and variety of production, diversity of scenery, or peculiarities of 

 geological character. A similar degree of talent and energy to that which has 

 been so successfully employed on those objects, maybe no less advantageously 

 directed, to an examination of the habits and modes of life, by which the in- 



• Annales de Chimie, torn, xxxvi. p. 268. 



