On the Differences in the Structure of Calculi, 17$ 



singularity of the form and external appearance of this cal- 

 culus, it was not sawn through ; the nucleus, in all proba- 

 bility, is a small kidney calculus, which lodging in the ure- 

 thra has become coated with triple phosphate. 



Section V. 

 Analysis of Calculi from other Animals. 

 1. The Horse. 



A. From the kidney. 



A very large calculus, from the kidney of a horse, was 

 composed of 



Phosphate of lime - 76' 



Carbonate of lime - 22- 



98' 



B. From the Madder. 



This calculus was also of a large size, its weight when pef- 

 fectly dry nine ounces and a half, its external surface very 

 irregular, of a reddish brown colour, and covered with minute 

 crystals of theammoniaco-magnesian phosphate. On making 

 a section of it, the internal structure exhibited a radiated ap- 

 pearance, and was of a light brown colour. It consisted of 

 Phosphate of lime - - 45* 



Ammoniaco-magnesian phosphate 28* 

 Animal matter - - 15* 



Carbonate of lime - - 10* 



98- 



In another case the bladder of a horse was found to ht 

 nearly full of sand, the composition of which was as follows;- 

 Phosphate of lime - 60* 

 Carbonate of lime - 40* . 



100- 



3. The Ox. 



A number of small calculi from the size of a pea down- 

 awards, are not unfrequently found in the bladder of the ox. 

 Those in the Hunterian collection are of a pale brown co- 

 Jour, and of the size just mentioned ; some of them have 

 the mulberry appearance. 



They 



