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Nevertheless, it is safe to say that those who will not trouble to learn the general principles of the Beilstein arrangement lose time in the long run.The scheme is really not complicated, considering the great diversity of organic compounds, but it needs some explanation.There are at least three published guides to Beilstein's Handbuch but only one, Huntress' pamphlet, is in English. It can be read in an hour or less but will continue to be useful for reference.It is a very clear presentation, accompanied by helpful charts. It might well be supplemented by the larger System der organischenVerbindungen by Prager, Stern, and Ilberg. The new edition of Huntress contains nine additional pages, the chief enlargement being in the section on the heterocyclic volumes and in the practice problems for locating compounds.Now that the fourth edition of Beilstein and its first supplement are so near completion, some training in its use becomes almost essential to students of organic chemistry who expect to become chemists. Their best help, unless they read German fluently, will be Dr. Huntress' book.

New values are reported for temperatures and pressures for the triple points of krypton and xenon.Studies of the vapor pressures of krypton and xenon have been made, principally in the range of temperature just including the triple points and boiling points. The results indicate the accepted values for the boiling points to be in error and new values are reported.

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Notes 3293 yield. The copper catalyst was removed by filtration, washed twice on the filter with water (50 ml.) and the combined filtrate and washings acidified with sulfur dioxide while kept in an ice-bath. The acidified solution was extracted with ether (500 ml.) in a continuous liquidliquid extractor for twenty-four hours. The ethereal solution was concentrated on the steam-bath to a small volume (ca. 50 ml.), the gentisic acid precipitated by the addition of Skellysolve-C and recovered by filtration.The yield of a light tan colored product was 11.1 g. (72%), m. p. 190°.Recrystallization from boiling water, after carbon treatment, gave a white crystalline material, m. p. 205°; mixed m. p. with an authentic sample of gentisic acid gave no depression.