COOLING OF ANIMALS EXPOSED TO GREAT HEAT. gl^l 



1 shall here subjoin some remarks with regard to the ob- Remarks on 

 servations in this table. ^'^^°^- 



Beside the experiments, of which I have given the re- others made. 

 suits, I made many others, on the accuracy of which I 

 could not equally depend. Their results however were 

 analogous to those in the table. 



Whatever precautions I took to prevent it, there were The heat not 

 always some variations in the temperature of the apparatus ^""« constant 

 during the experiment. These variations did not in general 

 exceed one degree [I'S'' F] ; but sometimes they amounted 

 to 3" [5*4P F.], though for a very short period. 



When I employed the same animal in different experi- Animals, 

 mcnts, I always suffered at least twenty-four hours to elapse 

 between them. 



The different thermometers I employed not being uniform Thermometers. 

 in their motions, I examined these with care, and formed a 

 particular scale of reduction for each, by means of whiqji 

 I reduced the several results of the different observations to 

 one common scale. Though I have employed tenths of a 

 degree in noting the results, I do not pretend to have been 

 always thus exact in my observations; but I chose rather to 

 express them thus, than to commit voluntary errours. The 

 errours I have committed involuntarily however cannot at 

 any time have exceeded a quarter of a degree. 



The temperature of an animal previous to its in troduc- previous tem- 

 tion into the apparatus has frequently exhibited trifling P^'^*^"^^- 

 differences, the cause of which I could not ascertain. 



It was not easy to ascertain the temperature of the frogs Manacremem of 

 immediately on their being taken out of the box, and with-^'^^ *'^°S=^- 

 out its being influenced by the contact of the hands or the 

 external air. To effect this, I tied the animal on a kind 

 of cart made for the purpose, and placed a thermometer 

 with a very small bulb, so as to remain in its mouth, or 

 rather in its stomach. On opening the box, I had only to 

 take out the cart quickly, and examine the degree indicated 

 by the thermometer. 



On looking at the table we perceive, that the tempera- The tempera- 

 ture of the warm-blooded animals uniformly rose two oc*""^? °(^*^*^^"'* 

 three degrees at least above the moist air, in which they of the medium. 

 wer# immersed i whence it is evident, that the faculty of 

 Ji b 2 producing 



