AND ANIMAL LIFE. 157 



and that of the adult in summer, are more sus- 

 ceptible to cold ; and as I have now attempted to 

 shew that the circulation induced by spirits is 

 precisely of the same character, if the reasoning and 

 illustrations in the former instance are allowed to 

 be correct, it is impossible to deny that the con- 

 clusions to which we arrive in the present are 

 also sound and legitimately drawn. 



CLXXVI. Although the general phenomena 

 in these instances are of the same kind, yet there 

 are certain differences between the state of the 

 system occasioned by spirits and that peculiar 

 to childhood and summer, too important to be 

 passed over. 



The external circulation in summer, and in 

 early life, arises from a permanent and general 

 cause, or of certain organic conditions of the 

 frame, while that which is produced by stimu- 

 lants is from a partial and evanescent cause. As 

 long as the blood is determined to the surface 

 from the regular and increased action of the 

 heart, the system does not materially suffer ; but 

 as this action, if the effect of spirits, very quickly 

 subsides, the vascularity of the capillary vessels 

 is not maintained by the uniform transmission of 

 blood, and consequently the greater surface of 

 blood exposed to the action of cold is left to 

 contend against its influence, without possessing, 

 as before, increased momentum, and highly stimu^ 

 lating properties. This view, conjointly with 



