Opticks : or, A treatise of the reflections, refractions, inflections and colours of light . THE SECOND BOOK OF OPTICKS. P A R T I. Obfervations concerning the Reflexionsy Re-fraBionSy and Colours of thi^t tranfpa-rent Bodies, T has been obferved by others,that tranfparent Subftances, asGlafs, Water, Air, &V. whenmade very thin by being blowninto Bubbles, or otherwife formedinto Plates, do exhibit various Co-lours according to thcjr various thinnefs, altho at a greater. BOOK II. 169 a greater tlucknefs they appear very clear andcolour!efs. In the former Book I forbore totreat of, thefe Colours
Opticks : or, A treatise of the reflections, refractions, inflections and colours of light . THE SECOND BOOK OF OPTICKS. P A R T I. Obfervations concerning the Reflexionsy Re-fraBionSy and Colours of thi^t tranfpa-rent Bodies, T has been obferved by others,that tranfparent Subftances, asGlafs, Water, Air, &V. whenmade very thin by being blowninto Bubbles, or otherwife formedinto Plates, do exhibit various Co-lours according to thcjr various thinnefs, altho at a greater. BOOK II. 169 a greater tlucknefs they appear very clear andcolour!efs. In the former Book I forbore totreat of, thefe Colours, becaufe they feemed of amore difficult Confideration, and were not necef-fary for eftabliihing the Properties of Light theredifcourfed of. But becaufe they may conduce tofarther Difcpveries for compleating the Theory ofLight, efpecially as to the conftitution of theparts of natural Bodies, on which their Coloursor Tranfparency depend j I have here fet downan account of thern. To render this Difcourfefhort and didindt, I have fiifl defcribed the prin-cipal of my Obfervations, and then confiderdand made ufe of them. The Obfervations arethefe. Ohf. I., Comprefiing two Prifms hard toge-ther that their fides (which by chance were avery little convex) might fomewhere touch oneanother : I found the place in which they touch-ed to become abfolutely tranfparent, as if theyhad there been one continued piece of Glafs,For when the Light fell fo obliquely on theAir, which
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