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Mongols of the Twentieth Century. By Robert A. Rupen. 2 Vols.[Bloomington: Indiana University; The Hague: Mouton & Co., 1964. xxii+ 510 pp. and xii+ 167 pp. $5.00.]
VII.-NeLllton's use 0/the Slit and Lens· in forming a pl (; re spectn, tm.-Common 6i'J'01'concerning this.-Ejfecti'venes8 of Newlon's T! wtlwd in showing the dark lines on a screen.