COOLING OF ANIMALS EXPOSED TO GREAT HEAT. S69 



furnace BB; and is conveyed into the box by a tube cc. 

 Over the aperture of this tube, within the box, is placed 

 at a little distance a plate II, fig. 2, about four inches 

 square; which prevents its ascending in a direct current to 

 the top, and causes it to be distributed pretty uniformly 

 throughout the apparatus. Toward the bottom of the tube 

 of communication cc is a cock, so constructed, that the 

 vapour may pass through a lateral opening, or through the 

 tube itself, or through both at once. This allows the 

 quantity of vapour admitted into the apparatus, and con- 

 sequently the temperature, to be regulated at will. This is 

 the more easy, as by means of a very simple contrivance, 

 the key of the cock may be turned, without losing &ight of 

 the thermometer, that indicates the temperature of the box. 

 To the key of the cock is affixed a pretty long lever, ee, 

 from each end of which a string passes to the correspond- 

 ing end of a lever of the same length, rfd, turning on a 

 pivot fixed on the top of the box. Of course by moving 

 the lever dda. similar motion will be given to ee. A sec- 

 tion of the cock is given at fig. 3. In the top of the boiler 

 C C is a funnel with a cock, by means of which it can be 

 replenished with water when necessary. 



Into this apparatus I introduced successively warm-blood- Experiments. 

 ed animals of different kinds, and frogs; I exposed them 

 to dilFerent degrees of heat : and I carefully examined their 

 temperature, both before and after the experiment, by 

 means of a thermometer introduced into the rectum, or 

 plunged deep into the cesophagus. The results I obtained 

 are given in the following table. 



SyppLEMENT— Vol. XXXL P b Table 



