Page:Reflections upon ancient and modern learning (IA b3032449x).pdf/119

 ved. In order to this, it will be necessary, (1.) To find out all the several Affections and Properties of Quantity, abstractedly considered; with the Proportions of its Parts and Kinds, either severally considered, or compared with, or compounded with one another; either as they may be in Motion, or at Rest. This is properly the Mathematician's Business. (2.) To collect great Numbers of Observations, and to make a vast Variety of Experiments upon all sorts of Natural Bodies. And because this cannot be done without proper Tools, (3.) To contrive such Instruments, by which the Constituent Parts of the Universe, and of all its Parts, even the most minute, or the most remote, may lie more open to our View; and their Motions, or other Affections, be better calculated and examined, than could otherwise have been done by our unassisted Senses. (4.) To range all the several Species of Natural Things under proper Heads; to assign fit Characteristicks, or Marks, whereby they may be readily found out, and distinguished from one another. (5.) To adapt all the Catholick Affections of Matter and Motion to all the known Appearances of Things, so as to be able to tell how Nature works; and, in some particular Cases, to com-