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The obscure part of the description relates to the hop-per, and the apertures by which the water is discharged!from it into the perpendicular pipe. The hopper seems-.to be divided into two upright partitions ; and there are“ two horizontal rectangular openings, through whichthe water runs into the two hoppers, each of them aboutseven inches and a half long, and in width five inches-and a half, measured on the level of the bottom of thereservoir, which width is reduced to four and a half atthe extremity of the air pipes, where the hopper alsoterminates.”

The author observes that in this machine, the water,issuing from the hopper, is necessarily reduced into drops.To satisfy himself more fully of this particular, he tooka tin vessel, eight inches and a half square and six and ahalf high : in the middle of the bottom he cut a rectan-gular opening, about an inch and a tenth long, and eighttenths wide : to the two long sides of the flit he solderedtwo tin plates, inclined to one another, and a third acrossthem. These apertures, he fays, represent those of themachine when the stoppers are drawn up ; and water putinto this vessel came out always, during the whole timeof its running, in streams which struck against andcrossed one another, and which, after spreading, were re-duced into drops.

In this illustration of the machine, though it seemsclear, there must be something which escapes my appre-hension. Having cut an aperture of the above dimen-sions in the bottom of a vessel, I fitted to each of thelonger sides a plate half the width of the aperture, bothof which plates were moveable, and kept at differentinclinations by means of the third plate which passedacross the middle of the two. The vessel being filled withwater, I could not observe, as indeed was expected, the

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