Page:Philosophical Transactions - Volume 003.djvu/228

 do in the transportation; where is added the great usefulness of this Instrument, with an intimation of others of a different kind, &c.

23. Confirms, that Mercury in a Barometer will be kept suspended higher at the top, than at the bottom of a hill: on which occasion something is noted about the height of Mountains, especially the Pic of Teneriff, esteemed to be in its perpendicular height 7 miles, by the more accurate observations.

24. Shews, that the Pressure of the Atmosphere may be exercised enough to keep up the Mercury in the Torricell. experiment, though the Air press upon it at a very small orifice.

25. Shews, that an oblique pressure of the Atmosphere may suffice to keep up the Mercury at the usual height in the Torr. Experiment, and that the Spring of a little included Air may do the same, together with the use that may be made of the former experiment for a portable Baroscope.

26. About the making of a Baroscope, that serves but at certain times; taking notice of the arguments it affords against a Fuga Vacui.

27. About the Ascension of Liquors in very slender Pipes in an exhausted Receiver.

28. Touching the great and seemingly spontaneous Ascension of Water in a Pipe fill'd with a compact Body whose particles are thought incapable of imbibing it: by which is examin'd an Explication, that has been made of the cause of Filtration.

Whence a probable cause of the Ascension of Sap into Trees is suggested. An attempt annex'd, to make a Syphon, that should run of it self without Suction.

29. Of the seemingly Spontaneous Ascension of Salts along the sides of Glasses; with a conjecture at the cause of it.

30. Contains an attempt to measure the Gravity of the Cylinders of the Atmosphere, so as that it may be express'd by known and common weights.

31. About the Attractive Vertue of the Loadstone in an exhausted Receiver.

32. Shews, that when the Pressure of the External Air is taken off, 'tis very easie to drawup the Sucker of a Syringe, though the hole, at which the Air or Water should succeed, be stopt.

33. About the opening of a Syringe, whose Pipe was stopt in the exhausted Receiver, and by the help of it making the Pressure of the Air lift up a considerable weight. Rh