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and at like distances under these, a third and a Fourth. Toeach hole was fitted a hopper which exactly closed it.

All the holes being stopt, the funnel was first hung freein the pipe, as in the former trials, and the height to whichthe water rose in the gage was marked. The funnel beingthen let down into the pipe, so as exactly to close it, theupper air holes were opened : the gage did not now rife sohigh as before. The upper air holes being stopt, and thesecond row opened, the gage continued at its last height.With the third row open, it rose rather higher than thefirst mark ; and with the fourth it fell the lowest of all.

The several entrances for the air were then opened bytwo and two. With the space between the funnel and pipe,and the upper air holes, open, the gage did not rife so highas with the space only ; and with the upper and second rowof holes it continued at the fame height. With the secondand third, it rose considerably further, though not up tothe first mark j and with the third and fourth, it sell alittle below the preceding height. In all these cases, wheretwo rows of holes were open, the water manifestly did notfill the bore of the pipe at the upper holes; but spread soas to completely fill it by the time it had reached the lowerones, at which last, part of the water spirted out and car-ried some of the air with it.

In another pipe of the same size I made two sets of airholes, three inches apart, and the uppermost of them twelveinches from the orifice of the funnel. With the upper rowopen, and with both rows open, the gage rose almost equally,being only a little lower in the latter circumstance than,;in the former ; but with only the lower row open, it funkabout one half. These being all stopt, and another setbored opposite to the orifice of the funnel, the gage rose ashigh as in the first cafe.

These