Upon reflecting on the Quantity of air I obtained From the piece of Ice, it appeared unreasonably great. This induced me to suspect that the warmth of my Room, (it having remained a whole night after the Ice was dissolved) might have rarified it and forced some water from under the edges of the glass: I therefore determined to repeat the experiment thus. I cut a piece of ice to the exact size of 4 Inches square, and 1 Inch thick, equal to 4 cubic Inches. I put it into a tumbler of water and inverted it, keeping it so compleatly Full as not to admit the smallest bubble of Air. I then watched the dissolution and collected the Air into a little bottle the moment the Ice was dissolv’d, not leaving time for the heat of the Room to affect the Air. The quantity collected you will see is much less than before and probably is not quite ¼ of an Inch cube that is not th part. Some very small bubbles adhered to the sides of the Tumbler and could not be collected, so upon making allowance for all Circumstances I think the Quantity may be fairly estimated at about th part of the bulk. Then comes the Question will an increase of Bulk of one th part, make a body whose specific gravity was before at 0, float th out of Water or is there any other cause that produces this effect? I am as ever most dutifully Yours