11ie1hyl-~-nitmvinyl)iiidole in 50 In1 uf pyridiiie. The reaction was exothermic and a solid appeared. After staiiding overtlight 1he mixt,ure was diluted with cold water, and the precipitatr wa. cdlected and dried. Reductioti of 12.2 g of VI with 10 g of TL41IIa i n 400 in1 oi T I I F gave 2 . 5 g of a subataiire, tqi 186 -170' ( 2 mm), mp 100L102"
(petroleum ether (kip :~O--6Uo )--ethyl acetate J, which was iticiil I fied as rli-~-nielIiyltr~-p~:inii~ie ( V I 1 ) hy mixture nieltitig poilit.
Acknowledgment.- \Ve itre iiidebtecl t o .\Ir. II. G . .\IcC:tiiii i i f ~Iic~r~raii:tlytic~al I,:ihor:ttory, Satioii:il I n ~ t i t u l ciif~ Arlhriti: r r i t l .\Iel:itx~lic~l)inenxes, for a i d ~ - w s . ihe
Book Reu iews Survey of European Nonconventional Chemical Notation Systems. Edited by I l o s a ~ rE~. H. FREER.Publication No. 1278, National Academy of Sciences, rational Research C o u n d , Washington, D. C. 78 pp.
This is a 78 page addendum t,u the 467 page publicat'ioli no. I150 entitled, "Survey of Chemical Xotation Systems," which appeared in 1964 and covered those tenis in actjive use in thcs United States. Since this is a supplement to the original publication, it utilizes the terms arid definitions given in publicatioii 110. 1150. It should be emphasized that, to benefit from the European report, one must have a copy of the original report 1150. The definitions of terms arid the historical summary given i t i publication 11.50 represent a n important etep toward standardization in this complex and swiftly growing field, and anyone interested in following it should carefully study those sections of the original report. The present publication serves as a11excellent supplement to [he original report, and the two reports cover all work heing clone ill this field, with t,he exception of some efforts in the Soviet I~nii)iiarid Japan. Those involved witjh chemical informatioil retrieval, including the storage of chemical structural iiiformation as well as properties, will need to study bot,h of these report->. Those who are working in this area are keenly aware of the fact tmhtttnone of us has been formally trained for this type of work. Therefore, careful study of such publications :IS these two surveys is absolutely mandatory for anyone who is trying to keep up viii'li t,tie field of chemical inforniat,ionretrieval. KLISS AND FRENCH I~ABUIt.Yl'l)lUES PHILADELPHIA, PENKSYLVANIA HMITH
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