. The Philosophical magazine; a journal of theoretical, experimental and applied physics . eresting subject. Weknow that if the crystals be both polarized and analyzed cir-cularly, and we disregard any dispersion of the axes for variouscolours, the axis of a uniaxial and 07ie of the two axes ofa biaxial present ultimately similar phenomena. Here, forexample, is the well known system of rings and brushes pre-sented by a plate of calcite (fig. 1). As is well known, ifwe interpose between the polarizer and the crystal a quarter-wave plate, the black cross disappears, to be replaced by greynebulou
. The Philosophical magazine; a journal of theoretical, experimental and applied physics . eresting subject. Weknow that if the crystals be both polarized and analyzed cir-cularly, and we disregard any dispersion of the axes for variouscolours, the axis of a uniaxial and 07ie of the two axes ofa biaxial present ultimately similar phenomena. Here, forexample, is the well known system of rings and brushes pre-sented by a plate of calcite (fig. 1). As is well known, ifwe interpose between the polarizer and the crystal a quarter-wave plate, the black cross disappears, to be replaced by greynebulous lines (fig. 2), on alternate sides of which the quadrantsare dislocated; and if now we interpose a second quarter-waveplate between the crystal and the analyzer, when the latter iseither crossed or parallel even these lines disappear, and weget simply a series of circular rings with no break whatever(fig. 3). Let us now take a plate of sugar cut across one of * Communicated by the Physical Society, having been read at theMeeting on November 12, 1881. Jr^nu iviag. . j^i. i.
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