lor 



enables us, in a single essay, to know the habitudes of a sub- 

 stance with respect to caloric through a wide range of tempera- 

 ture, and to combine with its agency either the affinity of oxy- 

 gen, or the action of the most powerful reducing body which 

 chemistry affords. We can arrange our flame as the phenomena 

 may direct, and increase the magnitude of this apparatus with- 

 out limit ; while the other cannot, in prudence, be attempted on 

 a large scale, and is scarcely manageable as to the nature and 

 intensity of its flame. 



T. R. ROBINSON. 



s 



January 11, 1818. 



VOL. XIII. 



