Excerpt - page 40: "... the basement and whispered for his messenger to fire an illumination flare through the window. The mes- senger fired a whistling-type ..."
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Excerpt - page 53: "... Zernike compared phase contrast qualitatively with the Schlieren method, oblique darkground and central darkgroundillumination. ..."
Excerpt - page 141: "... chalk or white-sand it is apple- green, over yellow sand dark-green, brown or black over darkground, and grey over mud. (PG 190-191) This description not only ..."