0}i I he Theory of Mixed Gases. 413 



** experiment, as the result of it agrees witk 

 ** all the above authorities,* Schmidt's only 

 " excepted, 1 cannot question it. The vapour 

 ^* in your experiment was of the force .of 3.L 

 " inches ; the force of vapour of 12G° in my 

 *' table is 3.89 inches; but the reason why 

 ** your's falls short of mine is, two minutes are 

 ** insufficient to diffuse the full quantity of 

 *' vapour through a bottle of such magnitude ; 

 " the temperature within would not be quite 

 " 126** 5 and the uncovering it with the hand 

 ** suffers a small portion of the internal vapour 

 *^ to escape, which cannot be restored in an 

 '* instant. But how is this result to be recon- 

 *' cikd with Schmidt's, which makes the force 

 **, of vapour of only .106** nearly 10 inches ? 

 " If you have any doubt remaining of the in- 

 " decisive nature of Schmidt's experiments on 

 *' moist air, you have nothing to do but to 

 ** immerse the same phial perpendicularly, 

 *"^ with its mouth open downwards in water of 

 " 106% and keep it in that position till no 

 " more bubbles escape, which 1 presume will 

 " be in 4 or 5 minutes. — Then treating it as 

 " before, and allowing for the additional 

 *' pressure of the water, the full quantity of 

 " vapour may be obtained. If you find it to 



"' Tol. Roi, and M. <le Saussure. 

 '3 F 2 



