rpHH separation of thorium from the rare earths, particularly in -* monazite, is of great interest. Previous work on the subject has been critically reviewed by XX'illard and Gordon (11), who also describe an elegant method for the decomposition of monazite and the estimation of thorium therein. Reference may also be made to a later communication by Gordon, Vanselow, and Willard (£). Several reagents have been under investigation in this laboratory (4, 9, 10). Organic reagents present the advantage that the precipitate is voluminous and enable small quantities of the metal ion to be handled convenient!!". m-Cresoxyacetic acid, which is described here, gives with as little as 2.0 mg. of thorium oxide a precipitate large enough for easy handling. The precipitate has a varying composition and cannot be weighed directly, but this difficulty is overcome by igniting to the oxide.
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