124 ROYAL SOCIETY OF CANADA 
Having thus determined the number of calories required to raise 
the system one degree, a weighed quantity of a solid to be experi- 
mented upon is introduced in a finely ground condition into the liquid 
in the calorimeter and two or three determinations made in the same 
way as the one just described, the result giving the number of calories 
required to raise the calorimeter, etc., plus benzol, plus solid one degree. 
By subtracting the result first obtained from this one, the heat required 
to raise the solid one degree is determined, and dividing this by the 
weight of the solid in grams its specific heat is obtained. 
As has been intimated above, the process requires further improve- 
ment, and the calorimeter employed must be larger; but the results 
already obtained seem to indicate that the method is sound in principle 
and capable of being modified so as to give a degree of accuracy equal 
to that of any method previously employed, while its carrying out is 
extremely simple. ‘A few results obtained with the apparatus described 
are here appended: 
Number of calories required to raise apparatus plus 100 grs. 
benzol 1 degree: . 
52-67 
52°53 
52°53 
52°56 
52-78 
The benzol employed above was the commercial article, not 
specially pure. 
Number of calories required to raise apparatus plus 100 grams 
benzol plus 58-22 grs. BaCl,-2H,O one degree: 
65:34 
65:46 
Subtracting from each of these 52-61 calories, the mean of the series 
of the determinations above, and dividing the remainder by 58-22, the 
weight of crystallized barium chloride present, 0-219 and 0-204 are 
obtained for the specific heat of the compound. In a similar manner 
the specific heat of the anhydrous salt was determined—0-0817 and 
0-0833. For crystallized copper sulphaic (5 molecules water) the num- 
bers were 0-322 and 0-306; and for the anhydrous compound, 0-222 
and 0-218. 
As will be observed, the determinations in the cases of the anhy- 
drous compounds are much closer than in the cases of the crystallized 
ones, and this is to be attributed to the fact that the latter were not 
