SIX MONTHS IN MEXICO. 249 



be advantageously combined with small doses 

 of rhubarb, or of ipecacuanha, in addition to 

 the opium. 



Diarrhoea ought not to be suddenly check- 

 ed, unless it has exhausted the strength of the 

 sufferer. If it have, or if it have become 

 chronic, it may be then restrained by gentle 

 means, such as small and repeated doses of 

 rhubarb, combined with a grain of calomel, 

 and, at bed-time, with half a grain or a grain 

 of solid opium. 



Cholera must be differently dealt with. — 

 You ought to restrain it immediately by 

 means of a very large dose of opium (about 

 two or three grains) ; and after the violent 

 vomiting and purging have subsided, take 

 repeated but small doses of calomel and 

 rhubarb, until bilious evacuations are pro- 

 cured. If these means fail, and if your 

 strength be very much exhausted, take Ma- 



