52 ANSWERS to the OBJECriONS 



dently is to have again recourfe to the fallacious argument, al" 

 ready difcufled, of a cold body cooling a warm body, without 

 being warmed ; and it is to fuppofe a Ihower of fnow produced 

 in the warm air of the chamber, by the introdudlion of cold 

 air, without that cold air mixing with the warm. But how is 

 one body of air fuddenly to cool another body of air, without 

 their mixing together ? At leaft, it is as natural for thofe two 

 bodies to be mixed together as to form a medium temperature ; 

 and if M. de Luc is to found an argument upon any of thofe 

 events not happening in that manner, he fhould point out 

 fome other reafon for his fuppofing that they do not mix, than 

 that of their forming a condenfation of humidity ; an event 

 which (hould happen, according to the principle we have en- 

 deavoured to eftablifh ; a principle which M. de Luc would 

 perfuade us to believe to be without foundation. 



Our author then forms the fuppofition of another ftate of 

 the cafe, in order, no doubt, to put things in a clearer light ; 

 but, without more accurately attending to the circumftances of 

 the cafe than he has done, it has no other efled, in my opinion, 

 than to perplex the fubjedl more and more. He fays, " Si au 

 " lieu d'une fimple ouverture a la chambre, fes parois euffent 

 " ete enlev6s, et que la maffe de fon air eut ete ainfi en contadl 

 " tout le tour avec Tair exterieur, il s'y feroit auffi forme un 

 " nuage ; mais alors il auroit bientot difparu en s'evaporant, 

 " comme celui de I'eau bouillante difparoit dans I'air qui I'en- 

 " vironne." 



Here M. de Luc does not feem to be fenfible that he is only 

 defcribing what fhould adually happen according to the theory. 

 But he had juft now given us to underftand, that he was to ex- 

 plain the formation of fnow or rain, in this cafe, upon fome 

 other principle than that of the propofition which has been 

 now fo fully confidered. How far he has performed that un- 

 dertaking, I would willingly leave to be decided by thofe who 

 may be more impartial judges in this cafe. But left it fhould 



be 



