AND ANIMAL LIFE. 135 



nerate less heat, and that the power of bearing 

 cold diminishes because the production of this 

 principle is increased. This must be allowed to 

 be the meaning of Dr EDWARDS, if we agree 

 with him that young animals have an inferior 

 power of evolving caloric. 



CXLII. When a young animal is subjected to 

 cold, it is quickly affected ; the blood is speedily de- 

 termined to the internal organs, and the body shows 

 a great diminution of temperature : but the very 

 conditions which promote this sudden change are 

 those which are favourable to the re-establishment 

 of the normal functions. The surface of the body 

 at this period is naturally vascular, and on this ac- 

 count is more sensible to the application of heat ; 

 and it is this character of the circulation which ex- 

 plains the phenomena connected with the present 

 subject. 



CXLI1I. When the temperature of an adult 

 is much reduced, the system recovers with dif- 

 ficulty the possession of its ordinary powers. 

 The vigorous frame of a full grown animal is not 

 readily controlled or influenced by cold : it con- 

 sequently follows, that if it be oppressed by this 

 agent, its degree must have been severe, or its em- 

 ployment long continued circumstances which 

 we are not compelled to take into consideration 

 in reflecting on the changes which one of tender 

 years presents. 



