Scientific American June 1933 Volume 148 Number 6

By: Munn, Orson D.

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Features: Birth control and bigotry - applied intelligence, rather than creeds and doctrines, is needed in the sphere of human reproduction; Why the St. Lawrence Waterway (Seaway) - some of the many cogent arguments against the construction of this costly outlest from the west to the sea; Autocratic versus Democratic Diplomacy - past experience shows there is a definite need for a better understanding between military and civil officials; Scientific American's second test of telepathy; From the archeologist's notebook; Flies raised to test death sprays; The literary value of mathematical tables; Amateur astronomers' home-made observatories; Fly fast - land slow; A "Different" art museum in Toledo, Ohio; A mechanical cow; How beer is brewed; The world's most efficient pump - the heart. Unmarked. Average soiling and wear.