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About 100 diffusion experiments were carried out in separate test tubes; the growth of the resulting crystals and precipitates was extremely interesting to watch and often very colorful and spectacular.

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LETTERS TO THE EDITOR 95in amorphous carbon was estimated to be the order of 50A, which may be compared with the crystallite size of several tens of angstroms measured by x-ray methods for many kinds of amorphous carbon.T HE study of the iT-Band microwave spectrum of CH3SH is currently in progress. In the spectroscope, a 48-foot absorption cell is used with a double modulation method which employs both wide range saw-tooth 60 cycle/sec modulation and narrow range sinusoidal 87 kc/sec modulation. This technique in