Opticks : or, A treatise of the reflections, refractions, inflections and colours of light . S4 THE. THE SECOND BOOK O F OPTICKS PART IV. Qbfervations concerning the Reflexions andColour^ of thick tranfparent polij^dPlatzs. HERE Is no Glafs or Speculum howwell foever polifliedjbut, befides theLight which it refradts or refledls re-,gularlyj fcatters every way irregularlya faint Light, by means of which thepolifhd Surface, v/hen illuminated in a dark room by

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