PART I. 

 HEAT. 



INTRODUCTION. 



Q. What is heat? 



A. The sensation of warmth. 



Q. How is this sensation produced ? 



A. When we touch a substance of 

 higher temperature than ourselves, the 

 warmer substance keeps parting with its 

 heat, till both are of equal temperature. 



Q. What is that "stream of heat" called, 

 which flows thus, from one body, to another ? 



A. CALO'RIC. Caloric, therefore, is 

 the matter of heat, which passes from 

 body to body ; but HEAT is the sensation, 

 of warmth, produced by the influx of 

 Calo'ric. 



