78 



SCIENCE. 



[N. S. Vol. XXII. No. 551. 



4CoH.N ( CH3) .NO + CM,Bi\ = 



[CoH4(NO)N(CH3).]aH, + 



2CeHaN0)N(CH3).HBr. 



^ITiat IS, the hydrobromide of nitrosodi- 

 methylaniline and a base formed from the 

 union of two molecules of dimethylaniline 

 and the acetylene group are produced. The 

 base is proved to be tetramethyldiamido- 

 glyoxine N-phenyl ether, 



(CH3)2NC6H-N--pH-CH--^C6H,N(CH3)2. 



o o 



The reaction can best be interpreted by 

 the assumption of the formation of an in- 

 termediate addition product, from which 

 hydrobromic acid splits off easily. Diethyl- 

 aniline gives an analogous reaction. 



On the Preparation of Various Acyl De- 

 rivatives of Dimethyl 4-Amino-o-phthal- 

 ate: M. T. Bogert and R. R. Renshaw. 



On Some Nitro and Amino Derivatives of 

 Fluorescein (preliminary notice) : M. T. 

 Bogert and R. G. Wright. 



Researches on Pyrimidines: On 2, 5-Di- 

 amino-6-oxypyrimidine : Treat B. John- 

 son. 



The True Benzaldehyde-azo-henzoic Acids: 

 Frederick J. Alway. 



The Neutral Sulphite Method for Deter- 

 mining Aldehydes in Essential Oils: S. 

 S. Sadtler. 



The Detection and Determination of Ethyl 



and 31 ethyl Alcohols in Mixtures hy the 



Immersion Refractometer: Albert E. 



Leach and Hermann C. Lythgoe. 



The strongest commercial ethyl alcohol 



(91 per cent, absolute alcohol by weight) 



gives a reading with this instrument of 



98.3° at 20° C, while the reading of 



methyl alcohol of 91 per cent, strength by 



w^eight is 14.9°. Fifty per cent, ethyl 



alcohol by weight has a reading of 90.3°, 



while the same strength (50 per cent.) of 



methyl alcohol reads 39.8°, all readings 

 being made at 20°- C. 



The detection of wood alcohol by this 

 method is simple and consists in submitting 

 to refraction the distillate which one makes 

 for the determination of ethyl alcohol in the 

 regular manner in beverages, essences, tinc- 

 tures, extracts or whatever may be the na- 

 ture of the samples to be examined. If 

 the refraction of the liquid shows the, per- 

 centage of alcohol agreeing with that ob- 

 tained from the specific gravity in the 

 regular manner, it may safely be assumed 

 that no methyl alcohol is present. If there 

 is an appreciable amount of methyl alcohol, 

 the low refraction will indicate the fact. 



Not only can methyl alcohol be thus read- 

 ily detected, but the amount may be deter- 

 mined, . since addition of methyl to ethyl 

 alcohol decreases the refraction in direct 

 proportion to the amount present. 



A Comparison of Methods for the Deter- 

 mination of Fusel Oil: E. M. Chace and 

 W. L. Dubois. 



The general scope of the paper is limited 

 to the description and comparison of the 

 Roese and Allen-Marquardt methods, no 

 satisfactory results having been obtained by 

 the colorimetric method. The basis of the 

 Allen-Marquardt method is the separation 

 of the higher alcohols by extraction from 

 brine with carbon tetrachloride, their oxida- 

 tion to the corresponding volatile acids by 

 acid bichromate solution and their final 

 titration after distillation. It is regarded 

 by the authors of the paper as long and 

 tedious, but more accurate than the Roese 

 method. 



A Crucible Method for the Determination 

 of Sulphur, Halogens and Phosphorus 

 in Organic Substances: S. S. Sadtler. 



Methods for Examinations of Cellulose 

 Nitrate and Smokeless Poivders: Albert 

 P. Sy. 



