296 ON THE COMBINATIONS, &c. 
corresponding instances ;—for example, the diffe- 
rence between the diminution in the case of 1 
atom oil of vitriol + 1 water and that in the case 
of 1 atom oil of vitriol + 2 water amounts to 
0°.0388 ; and, the difference between the diminu- 
tion in the case of 1 atom oil of vitriol + 2 water 
and that in the case of 1 atom + 3 water amounts 
to 0°.0205: the difference between the heat 
evolved when 1 atom oil of vitriol is mixed with 
1 water and that evolved when 1 is mixed with 
2 water amounts to as much as would raise the 
temperature of water 19°.3:—if the differences 
between the diminutions of specific heat and the 
differences between the quantities of heat evolved 
bore a direct ratio to each other, that between 
the heat evolved when 1 atom oil of vitriol is 
mixed with 2 water and when 1 is mixed with 3 
water should amount to as much as would raise 
the temperature of water 10°.2; whereas, it only 
amounts to as much as would raise it 5°.3. But, 
to determine how far this observation may be 
generally applicable, a more extended series of 
experiments will be required; and, which, if lei- 
sure permit, I may, on some future occasion, be 
induced to prosecute. 
Bolton-le-Moors, Dee. 24th, 1838. 
