the rapidly increasing numbers of £9 communities reporting fluorine-bearing wa-W W ters, the occurrence of fluorine toxicosis has taken on added significance and is now generally recognized as a serious public health problem. Many localities find it
Urethans were prepared from these mixtures and recrystallized from petroleum ether. The mixture of ethyl and methyl did not produce crystals characteristic of the individual urethans. The other mixtures yielded crystals which could be identified. Care must be exercised to prevent one of the components from being separated out by the solvent.
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