The Philosophical magazine; a journal of theoretical, experimental and applied physics . copic apparatus belonging to the jdiysicalcabinet of Yale College, a quartz plate was found, cut perpendi-cularly to the axis, and exhibiting by polarized liglit an unusualintensity of colour. It is a made, the body of the plate consist-ing of left-iianded quartz, through which passes somewhat ex-centrically a band of right-handed quartz, 65 millimetres inbreadth. This band is not bounded by sharp lines of divisionon the sides, but by intermediate strips {b, b in the figures),al)out 2 millimetres in breadt
The Philosophical magazine; a journal of theoretical, experimental and applied physics . copic apparatus belonging to the jdiysicalcabinet of Yale College, a quartz plate was found, cut perpendi-cularly to the axis, and exhibiting by polarized liglit an unusualintensity of colour. It is a made, the body of the plate consist-ing of left-iianded quartz, through which passes somewhat ex-centrically a band of right-handed quartz, 65 millimetres inbreadth. This band is not bounded by sharp lines of divisionon the sides, but by intermediate strips {b, b in the figures),al)out 2 millimetres in breadth, which are of different structure,and are ap|)arently formed by the interleaving of the strata ofthe two portions at their edges. In the polarizing apparatusthese; strijjs simply vary from bright to dark, without niaiked* Pliil. Mag. S. -1. vol. xliii. \^. 3^2. of the Zodiacal Light. 15 appearance of colour. Placed between two Nicols, the plate hasthe appearance represented in the accompanying figures, whichare drawn of full size. When the corresponding diagonals of Fig. 1. Fig.
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