466 MORBID PRODUCTS. 



matter ;) and left a large amount of ash, consisting for the most 

 part of phosphate of lime. (See p. 385.) 



Calculi consisting of cholesterin with biliary resin and 

 colouring matter are sometimes passed from the intestines, but 

 as they must have had their origin in the gall-bladder, they 

 will be considered under the head of biliary concretions. 



Davy has found in intestinal concretions a large amount of 

 fibrous matter ; in one instance it amounted to 78, combined 

 with 21/5 of saline matter, and O5g of yellow pigment. In 

 another case it amounted to 74'4g, and was associated with 

 17*2 of resinous matter, 1*4 of brown faecal matter, and 7g of 

 salts. 



Laugier has observed hair in these concretions, matted 

 together so as to form thick pilous masses. 



[An essay on this subject by Dr. Douglas Maclagan, con- 

 taining several original analyses, and published in vol. i of 

 ' The Edinburgh Monthly Journal of Medical Science/ may 

 be consulted with advantage.] 



Intestinal Concretions in Animals. 



Intestinal concretions are by no means rare either in the 

 carnivora or herbivora; they seem to be especially common 

 in horses. They consist principally of the most insoluble salts 

 that occur in the food, which, instead of being uniformly 

 distributed throughout the whole of the chyle, are collected at 

 particular points, or else after having been dissolved in the sto- 

 mach, are precipitated in the small intestines by the free alkali 

 of the bile, and settle around any nucleus they may meet with. 

 The principal constituents of intestinal concretions are phos- 

 phate of lime, phosphate of magnesia, ammoniaco-magne- 

 sian phosphate, and occasionally the carbonates of lime and 

 magnesia. Gurlt 1 remarks that the reddish gray concretions 

 found in the stomachs of horses sometimes attain a very consi- 

 derable size; (he mentions a case in which a concretion weighed 

 14 pounds ;) they consist of concentric lamina, and are very 

 hard. In horses they have occasionally a bluish- gray tint. 



I have analysed a concretion taken from the csecum of a 



1 Patholog. Anatoraie der Haussiiugethiere, p. 35. 



