In the back of the plies for microscopists. Eight- stage, below the central aperture, is formed a groove for een of them, at least, are required. The paper tube receiving the black glass polarizing plate. The groove inclosing these glasses is a little more than }{ in. inter- supports the black… … black glass plate. Mica plates of suitable thickness are selected by trial in the instru- AND ment, and preserved for future use. It is sometimes desirable to rotate the end of the tube, and both the hand piece and the stage polarizer. When the black glass plate is used, this is A recent scientific…
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