March 26, 1897.] 



SCmNGE. 



521 



.by the replacement of an atom of hydrogen of 

 the benzol ring by the metal, is not applicable 

 here, as he considered the hydrogen replaced 

 to be the one between the the nitro groups. In 

 the compounds here studied this position is oc- 

 cupied by other groups, but it is perhaps the 

 hydrogen between the nitro and carbosyl groups 

 which is replaced. The evidence, however, is 

 not conclusive, as there are facts which support 

 this theory and others which are against it. One 

 of these colored compounds was isolated and 

 studied and some derivatives prepared. 



On the Action of Chlorcarhonio Ethyl Ester on 

 Formanilide : By H. L. Wheeler and H. F. 

 Metcalf. The authors have given in a recent 

 number of this Journal the method of prepara- 

 tion of formylphenylurethane. According to 

 some authors this breaks up, giving an amidine 

 and other products. The authors show that the 

 oil obtained by Freer and Sherman in this reac- 

 tion was not, as they stated, ethylisoformanilide, 

 but a mixture of several compounds. They also 

 succeeded in isolating a number of other final 

 reaction products. The structure of formanilide 

 is represented in two ways, either as an anilide 

 or as an imido compound, phenylimidoformic 

 acid. The structure cannot be determined by 

 the final reaction products, as the formation of 

 all the compounds can be readily explained by 

 either structure. According to the authors the 

 weight of evidence from recent work favors the 

 imido-acid structure. 



Notes of Student Work from the Laboratory of 

 Analytical Chemistry, University of Virginia : By 

 F. P. DuNNiNGTON. Analyses are given of a 

 variety of Ilmenite ; of ' Mineral Tallow ' from 

 Vermont ; of Marble from Texas, Md. ; of Alum 

 Water from Lee county, Va., and of Infusorial 

 Earth. A number of determinations were also 

 made of the power of certain calcium and mag- 

 nesium salts to absorb and retain water. No 

 regularity in the amount lost in certain time 

 could be detected, different salts requiring dif- 

 ferent times to be dehydrated. The formation 

 of definite hydrates by absorption of water 

 could not be established by a study of the 

 amount taken up. 



The Proteose of Wheat : By T. B. Osboene. 

 The author calls attention to certain wrong as- 

 sumptions which Mr. G. E. Teller had made in 



a recent article in this Journal, and also to a 

 fact he had overlooked in quoting the author's 

 work. The following books are reviewed : An 

 Introductory Course of Quantitative Chemical 

 Analysis, with Explanatory Notes and Stoichio- 

 metrical Problems, H. P. Talbot; A Simple 

 Method of Water Analysis, Especially Designed 

 for the Use of Medical OfBcers of Health, J. C. 

 Thresh ; The Gases of the Atmosphere, The 

 History of their Discovery, W. Ramsay ; A 

 Manual of Quantitative Chemical Analysis for 

 the Use of Students, F. A. Cairns. An obituary 

 notice of Eugene Baumann is also contained in 

 this number. 



J. Elliott Gilpin. 



THE ASTEOPHYSICAL JOURNAL, NOVEMBER, 1896. 



A Further Study of the effect of Pressure on the 

 Wave-lengths of the Lines in the Arc Spectra of 

 Certain Elements: By W. J. Humphreys. In 

 their previous work along this line* Messrs. 

 Mohler and Humphreys investigated the spectra 

 of twenty-three elements. The present paper 

 covers experiments upon some twenty-three 

 more. With some exceptions, the results of the 

 previous investigations were verified. In par- 

 ticular, the law that the shift is proportional 

 to the pressure into the wave-length of the line 

 considered was found to hold. In this con- 

 nection it was found necessary to divide the 

 strontium and barium lines into two groups, 

 as had been done with calcium. The relation 

 of the shift to the position of the element in its 

 Mendelejeff" group is also discussed. 



Prominences Observed August 8, 1896 : By J. 

 F]6nyi. Observations of the prominences are 

 given as being of possible interest in connection 

 with the solar eclipse of the above date. 



Notes on a Method of Determining the Value of 

 the Light Ratio : By Alexander W. Roberts. 

 A discussion of a method of determining the 

 light ratio for a system of magnitudes. That 

 is if the magnitudes of a number of stars are 

 given, with an unknown light ratio between 

 the magnitudes, a method is suggested by 

 which from an estimation of the magnitude of 

 two superimposed star discs the ratio may be 

 determined. A discussion of algol variables 

 follows. 



*Ap. J. February, 1896. 



