90 DK. GOODMAN ON LIGHT, HEAT. 



viz., zinc, '0927, which is electro-positive to copper, '0949. 

 La another statement, however, of capacities given by Dr. 

 Ure, it will be found that he names 328*5 for zinc, and only 

 320, for copper, so that the table in this manner is com- 

 plete — evincing the perfect analogy in numbers of the 

 capacity for heat and electrical ajinities of each individual 

 metal. 



CONCLUSIONS. 



Those who entertain the opinion that heat is not electri- 

 city, generally advance the argument that in electrical 

 experiments where heat is given off, it is the repulsion of 

 electric force towards caloric which expels the latter or 

 natural calorific force, and causes its diffusion into the 

 surrounding medium.* 



To expect to meet with these mutually repulsive forces 

 therefore, as existing together, in any large quantity in a given 

 substance, would, according to such an hypothesis, appear 

 absurd. 



But the experiments upon potassium detailed before this 

 Society, show that the most intense chemical, electrical, 

 or calorific force may be at any time elicited from this one 

 marvellous substance. 



We might state here that the recent experiments of Dr. 

 Faraday leave no doubt as to the fact that flanie, smoke, 

 metals, glass, and in fact every kind of matter, are obedient 

 to the laws and influence of magnetism. According to the 

 old notion, therefore, we must have six different kinds of 

 force at all times surrounding the ultimate elements of 

 matter. — But by the hypothesis of their mutual converti- 



* If this view were correct, what an extraordinary amount of calorio 

 wonld be absolutely contained in each substance ; for a wire red-hot, and 

 radiating heat between the poles of a Voltaic Battery, would continue red- 

 hot and radiate /or ever, if the same amount of voltaic force were only con- 

 stantly maint^ed ! 



