less than that of Water. And so small a resistance would scarce make any
sensible alteration in the Motions of the Planets in ten thousand
Years. If any one would ask how a Medium can be so rare, let him tell me
how the Air, in the upper parts of the Atmosphere, can be above an
hundred thousand thousand times rarer than Gold. Let him also tell me,
how an electrick Body can by Friction emit an Exhalation so rare and