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ducibility. The range of peak heights for five determinations was 118.4 to 121.5 mm. with a relative standard deviation of 1.1%.Similarly, seven determinations of a standard solution of Tinuvin P ranged in peak height from 94.5 to 97.5 mm. with a relative standard deviation of 1.2%.Polymers containing known amounts of the additives indicated an accuracy of approximately the same degree.

Ethchlorvynol (PlacidylR) is a moderately popular hypnotic drug often used in place of barbiturates. The drug was first marketed in 1955 and thought to be a safe drug, free from dependence properties. However, subsequent reports have shown that ethchlorvynol can cause dependence to develop [1,2] with severe withdrawal problems resulting from chronic high dosage [3,4].