CARBONATE OF MAGNESIA. 447 



the bones is combined with carbonic, and not with phosphoric 

 acid, and that the phosphate of magnesia found in the bones is 

 only formed during the analysis. This view is supported by the 

 circumstance that carbonate of magnesia is found with carbonate 

 and phosphate of lime in many pathological concretions. If, how- 

 ever, the magnesia were combined with carbonic acid in the bones, 

 it should be taken up with the carbonate of lime by dilute acetic 

 acid, and neither in my experiments nor in those of von Bibra 

 has this been the case. 



Von Bibra* observes, in opposition to the view of Berzelius, 

 that far more magnesia exists in the teeth than the carbonic acid 

 found there can saturate. 



Geigerf has published an analysis of a concretion extracted 

 from the nose; it contained 76*7-3- of mineral substances, of which 

 8 '3 were carbonate of magnesia. Bleyf found 27'66 of car- 

 bonate of magnesia in a stony concretion from the peritoneum of 

 a man. 



A very large quantity of carbonate of magnesia exists in the 

 urine of herbivorous animals, and hence we often meet with 

 this salt in the urinary concretions of this class ; it is very seldom 

 found in human urinary calculi. 



The urine of the ox, the camel, the horse, the rhinoceros, the 

 elephant, the beaver, and the rabbit, deposites carbonate of magnesia 

 with carbonate of lime. John found 10 of carbonate of magnesia 

 in the mucous deposit of the urine of a horse suffering from diabetes. 



Lassaigne|| found 4'8-g- of this salt, with carbonate of lime, in a 

 calculus from the bladder of an ox, while Wurzer^f obtained 4'06, 

 and Wackenroder** 3*5 22 of carbonate of magnesia from calculi 

 obtained from the horse. A calculus from the bladder of a man, 

 which was analysed by Lindbergsontt? contained, in addition to 

 the phosphates of lime and magnesia, 2'55 of carbonate of mag- 

 nesia, and only 3'14 of carbonate of lime. In two human calculi 

 analysed by Bleytt, there were found 5'7and 6'5-g- of carbonate of 

 magnesia, 



* Op. cit. S. 94 and 287. 



f Mag. f. Pharm. Bd."21, S. 24?. 



% Arch, der Pharm. Bd. 20, S. 212. 



Chem. Schriften. Bd. 6, S. 1G2. 



|1 Journ. de Chim, meU 2 Se'r. T. 4, p. 49. 



Tf Schweig. Journ. Bd. 8, S. 65. 



** Ann. der Pharm. Bd. 18, S. 159. 



tt Schweig. Journ. Bd. 32, S. 429. 



$$ Buchner's Repert. 2. B. Bd, 2, S. 165. 



