AND ANIMAL LIFE. 455 



rendered more stimulating than natural, can 

 scarcely be called in question ; and, in different 

 parts of this work, I have developed principles 

 which explain the mode in which the blood be- 

 comes unfit for the purposes of the system, on 

 account of its deteriorated qualities. Emetics, if 

 they simply cause nausea, will either arrest or 

 retard the flow of blood in all cases of active he- 

 morrhagy. The truth of this is observed in ve- 

 nesection accompanied by faintness. In this 

 instance the stoppage arises from the circulation 

 being generally depressed ; the blood has the 

 tendency to move towards the chest and internal 

 viscera in greater quantity than usual: and 

 if the feeling of nausea be continued for a 

 long time the blood becomes less stimulating; so 

 that we have two reasons why emetics, confined 

 to nausea, ought at all times to be prescribed in 

 active hemorrhage. The one is, that the extre- 

 mities and the superficial vessels receive less of the 

 sanguineous fluid ; and the other, that the super- 

 abundance, by surcharging the lungs, prevents the 

 ordinary degree of oocygenation, and, on that ac- 

 count, the heart does not propel the blood with its 

 won fed energy. 



DLIII. Emetics have been recommended in 

 pneumonic inflammations, by several distinguish- 

 ed continental physicians; by some for the purpose 

 of exciting nausea ; by others of producing vomit- 

 ing. It is extremely difficult to say whether the 



