[ *27 ] 
in the blood diminidles, fo that there en- 
fues a double lofs of caloric, and it is in 
this way that the heat of the animal is kept 
at its level, or furpaffes it but very little. 
Laftly, it may be advanced, that every 
thing lingular and wonderful obfervable in 
the heat of animals is capable of being 
very well explained, without having re- 
courfe to an occult principle of life, and 
that from thefe fadts I cannot deduce any 
conclufions favorable to my fyftem. If 
one could explain how animated beings 
which do not breathe, and which are fo 
circumftanced as not to be liable to have 
evaporation take place with them, have a 
power of generating heat and cold ; F if 
one could prove to demonftration that the 
inflammable principle is really increafed 
or diminifhed in proportion to the calls of 
neceffity, then I would allow that the 
powers of generating heat and cold to be 
known. But philofophers have not yet 
attained 
