368 RELATIVE ATTRACTIONS OF 
with 15.2 grains of water, and left it, along with 
undiluted acid in another dish, under an unex- 
hausted receiver (no larger than just requisite 
to cover the two dishes) standing in a plate of . 
oil, from the 12th February, 1838, to the 22nd 
March, exposed to a temperature ranging each 
day as high as 65°, sometithes as high as 77°, and 
never lower than 50°; during this time, the di- 
luted acid lost no weight. Now, the maximum 
evaporating force of the temperature to which the 
acid in this experiment was subjected, was equal 
to 1.06 inch of mercury ; and yet the acid lost by 
its action no water, though in a more dilute state 
than acid concentrated to the utmost under an 
exhausted receiver at the temperature of 48°, or 
with an evaporating force of only 0.46 of an inch 
of mercury. 
EXPERIMENT VI. 
I also diluted 100 grains of the concentrated 
acid, ina dish of the same size, with 14 grains of . 
water, and left it, with concentrated acid, under a 
similar unexhausted receiver standing in mer- 
cury, for a period of 23 days, in a stove, the tem- 
perature of which (as found by observations 
made three times a day) ranged from 76° to 96°, 
but chiefly between 85° and 91°; and though, as 
