Demonstrates that, notwithstanding the doctrine of positive levity, an oil, lighter than water, may be kept immersed in that fluid. Demonstrates that ascent and flux of water in syphons are explicable without supposing a Fuga vacui. The hydrostatical balance. Mercury rais'd by the spring of a little included air. A fountain maid by the spring of uncompressed air.
Mercury rises no higher by suction, than the weight of the atmosphere impels it.
The greatest height to which water can be rais'd by attraction or sucking pumps. The pressure of the external air being taken off, the sucker of a syringe is easily drawn up, tho' the lower orifice be stopp'd. The ascent of liquors in syringes owing to the pressure of the air. Bellows, with the nose stopp'd, open of themselves, when the pressure of the air is taken off. An attempt to examine the hypothesis of aether, as to its existence.