51 



CALCULI OR STONES IN THE INTESTINES. 



The nature and aggregation of the particles 

 which compose these bodies are not without 

 interest, as affording information on the conditions 

 which are present in the stomach and intestines. 

 Calculi are very common in the horses and ponies 

 of some coal mines,, and also among the horses of 

 millers, general carters, and those used in large 

 establishments where the system of feeding and 

 work is defective. 



Their origin is usually considered to arise from 

 water impregnated by the salts of lime, which 

 are precipitated in the same manner from solution 

 as occurs in the steam boiler or tea kettle. 



It does not follow that calculi form on the use 

 of such kind of water. It is also a most noto- 

 rious fact that from water of precisely the same 

 character supplied to the animals in two coal pits, 

 different results are manifest. In one, where 

 proper care in feeding and work is observed, there 

 is the greatest amount of health, but in the other, 

 where systems are the reverse, and especially 

 when work is excessive and irregular, calculi 

 exist. 



That the water draining from the magnesian 

 limestone, and holding lime in solution, has not 

 much to do with their formation, is proved by 

 several circumstances. 



First: Many calculi which I have found iu 



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