. American journal of pharmacy. plicated; either both crystals become opaque, as a fig. 8, or ON TODO-SULPHATE OF QUININE. 23 if the tourmalines are rotated 45°, so as to place the crystalsat the depolarizing angle both crystals become colored, a beinggreen and b pink, as in fig. 9. If 8 hexagonal tables are placedwith their axes on the radii of a circle 45° apart, every alternatecrystal will be black and the intermediate ones colored pinkand green. Other and different colors are developed when only the infe-rior tourmaline is employed with a selenite plate Herapath concludes
. American journal of pharmacy. plicated; either both crystals become opaque, as a fig. 8, or ON TODO-SULPHATE OF QUININE. 23 if the tourmalines are rotated 45°, so as to place the crystalsat the depolarizing angle both crystals become colored, a beinggreen and b pink, as in fig. 9. If 8 hexagonal tables are placedwith their axes on the radii of a circle 45° apart, every alternatecrystal will be black and the intermediate ones colored pinkand green. Other and different colors are developed when only the infe-rior tourmaline is employed with a selenite plate Herapath concludes his second essay with directions formounting crystals of iodo-sulphate of quinia so as to use themin lieu of tourmalines in polarizing apparatus, to which he con-siders them not only equal, but as possessing the power of polar-ization with five times the intensity that thd best tourmalines arecapable of. When disulphate of quinidin is dissolved in acetic acid, and adrop placed on a glass is allowed to evaporate, it is found t
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Keywords: ., bookcentury1800, bookdecade183, booksubjectpharmacy, bookyear1835
