1458
JOURNAL OF CHEMICAL EDUCATION
viewer does not fed that the structure symbol is an improvement over the structural formula. The electronic structure symbol is dots and lines; the usual electronic formula is dots and chemical symbols. It is lines versus chemical symbols, with the advantage t o the latter, for the electronic formula is not only less confusing but i t actually shows without any question which are shared pairs of electrons and which are not. Careful reading of this work has suggested the fallowing points. The plates of structure symbols are remarkably well done. I n a few cases clarity would be gained by a revision of the sentence structure. Empirical formula is applied t o what is ordinarily considered the molecular formula. Probably the most interesting topic in the text, "Prediction of Reactions," page 27, is difficult t o follow, due t o the omission of reaction V, an incorrect reaction X, and the use of numbered arrows, the meaning of which is not readily clear, directly below the structure symbols on pages 28 and 29. And, t w , does the author mean t o ignore the CmmBrown-Gibson Rule on pages 30 and 31 when he says that the position which the semnd substituent in the benzene ring takes depends upon the character of that substituent? The development in this text is interest-
ing, and doubtless as much good muld be gained from its use by the informed as by any other structural representation. The author has pursued the subject a t great length and has the satisfaction of having devised a compact, workable system of representation. C. A. B u e m s n UNIVERSITY OX TBNNBSSBB KNOXVILLB,
TBNN.
MISCELLANEOUS PUBLICATION Chemistry of Today. Broadcast Supplement of The Nucleus. Published under the auspices of the Northeastern Section of the A. C. S., Inc., P. 0. Box 1178, Boston, Mass., March, 1931. 21 pp. 15 X 23 cm. The Northeastern Section of the A. C.S. has been sponsoring a series of chemical radio talks for the past few months. I n this supplement are recorded the following radio addresses already delivered: "An I n t r o d u c t m Talk.". hv . M. 1. AHERN. "Side-Stemins .. . Nature's Processes." "Chemistry--An Aid to Industry." "The Wizardrv of Modem Chemistry," all by G u s ~ ~ v J. u sESSELEN. "Chemistry and the X-Ray," "Chemistry and Diet," "Chemistry and the Ductless Glands." all by ALLANWINTER Rowe.
Bibliography of French Technological Works. Fourteen of the leading French publishing firms which specialize in the production of technological literature have mmhined t o produce a "Bibliographie des livres f r a n ~ a i sd'Industrie < t de Technologic." The lines of the "Catalog of British Scientific and Technical Books" of the British Science Guild have been closely followed, with the following difference, namely, that books ~ublishedin 1929-30 precede the General Catalog for 1919-30, which forms the hulk of the work. Entries in Part 1 are annotated; those in Part 2 are not. The name and subiect indexes include both sections. Hence there is some danger of confusion, and the writer of the prefatory note wisely counsels the user of the Bibliography to consult both sections "acas de recherche." An annual supplement to the bibliography is promised with a consolidated edition every third year. The classification and indexing of the entries have been carried out in a workmanlike manner, and we have no doubt that the bibliography will prove a useful guide in the selection of French technological hwks in all parts of the world.-Nature
