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It consists mainly of grey dreary flats covered with selenite; and a little below the surface, gypsum.
Meyer (Ber., 1902, 35, p. 1 59 1) by the electrolysis of silver selenite in the presence of potassium cyanide obtained the value 79.22.
Such plates are generally made of mica or selenite, and the normal to the plane of polarization of the most retarded stream is called "the axis of the plate."
In fact, the lateral systems are obtained when a plate of selenite is substituted for the quartz.
Below the analyser G a plate H of selenite or mica may be put in the course of the rays.