AND ANIMAL LIFE. 167 



and upper part of the thorax unusually large, 

 florid, and vascular during torpidity. The opi- 

 nion I have brought forward to account for the 

 occurrence of the phenomenon, viz. that it de- 

 pends on the character of the external circulation, 

 the effects of which modify the production of 

 animal heat, whose influence is felt whether ex- 

 cited or depressed, by every organ of the body, is 

 consistent with a variety of facts and analogies, 

 and in harmony with every appearance which 

 these naturalists have adduced in support of their 

 own view. 



CLXXXV. The enlarged glands, their florid 

 and vascular aspect, the seeming superiority of the 

 veins over the arteries, are the very consequences 

 we should expect from the altered distribution 

 of the blood. If these had not been present, 

 the explanation I have given would have been 

 founded on assumed premises, and unsupported 

 by legitimate deductions. As the severity of 

 the cold increases, the circulation is changed ; its 

 vigour and general diffusion become now feeble 

 and concentrated ; the blood, which previously 

 warmed the whole system, is now bestowed upon 

 the internal organs, debilitating their functions, 

 as is proved by the diminution of temperature, 

 and the weak and slow pulsations of the heart : 

 but the determination is not confined to these 

 vital organs, but spreads itself throughout the 

 internal parts, producing congestion, or, in other 



