Attraction, opposition between modes of, [88]
Attraction, proportion of the mutual motions of, [76]
Balloon, hydrostatic, [159]
Barometer, [169]
Barker's mill, [182]
Battery, electrical, [387]
Berkeley, his ideas of matter, [2]
Boats, why they float, [139]
Boiling point as affected by the pressure of the air, [171]