National Geographic : 1941 Apr
436 The National Geographic Magazine Photograph by Willard R. Culver Infinite Pains and Months of Research Go into a National Geographic Society Map When the drawings have been completed by The Society's Cartographic Staff working in Washington, they are sent to A. Hoen and Company in Baltimore to be engraved and printed. Highway routes are being tacked over the master drawing. Other sheets showing river courses and mountain hachures will be added later. Photograph by Volkmar Wentzel White Mice Get Ultraviolet-ray Treatments at the National Cancer Institute The table rotates beneath the lamps, exposing the mice evenly to the rays. Scientists thus study exact conditions which produce cellular changes of the skin, as overexposure to the light causes cancers to form on hair-free tails and ears. Many other experiments on the cause, cure, and prevention of disease are being conducted at the new buildings of the National Institute of Health, Bethesda, Maryland.