The Philosophical magazine; a journal of theoretical, experimental and applied physics . ciple. If you were toattempt an illustration of your theory by actual experiment, Iam persuaded you would discover its fallacy. A circular plane surface, ten or twelve inches in diameter,lying in the plane of our horizon, with grooves cut in its uppersurface on lines drawn from the centre to the circimiference,might have a rotary motion given to it, and if globules of mer-cury were put into the grooves, the centrifugal force would bythem be exhibited, and you would find that no orbicular or anyother motion
The Philosophical magazine; a journal of theoretical, experimental and applied physics . ciple. If you were toattempt an illustration of your theory by actual experiment, Iam persuaded you would discover its fallacy. A circular plane surface, ten or twelve inches in diameter,lying in the plane of our horizon, with grooves cut in its uppersurface on lines drawn from the centre to the circimiference,might have a rotary motion given to it, and if globules of mer-cury were put into the grooves, the centrifugal force would bythem be exhibited, and you would find that no orbicular or anyother motion, that jou could communicate, would be able tobring all the globules of mercury at the same time to or towardsthe centre, which, if your doctrine was true, would undoubtedlybe effected by giving it a circular motion, similar to the motionof our earth in its orbit. I should very much like that you would try this, or some otherexperiment, by way of illustration, before you apply your prin-ciples to the phaenomena of a system of bodies moving withinthe gaseous medium of universal Let the circle O R represent the orbit of our earth; S thesun in the centre; E the earth j P E, a line drawn from thecentre of the earth through the point of projection; TG a tan-gent of the earth; AD a diagonal of the rectangle DPA, thelonger sides of which are to the shorter, as the orbicular motion ib 206 Experiments on Vegetatlort* is to the notary, or as eighty to one. Let us suppose the axis oftlK earth perpendicular to the plane of the earths orbit, thatthe earth is tuniini; fVorii A to G, and that it moves in the orbitin the direction E O. A stone piojectcd IVoni the piont A, willcontinue t(» rise till its vis intrlicc is ovcreonie hv the attraetionof gravitation, Ijy which it will l)e drawn to the point from whenceit was projected. The orbicular and r<jtary motions of the earth,have no power, whatever, to cause a body thus projected, to re-turn again to the earth ; but on the contrary
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