324 



SCIENCE. 



[N. S. Vol. VII. No. 166. 



this reaction polymerization takes place with 

 the formation of a naphthalene compound. 

 ' The Relation of the Taste of Acids to their 

 Degree of Dissociation' : By T. W. Eichards. 

 The relative strength and extent of dissocia- 

 tion of dilute acid solutions can be determined 

 approximately by the sense of taste. ' Note 

 on Fehling's Solution' : By J. B. Tingle. 

 ' The ordinary solution containing tartaric acid 

 is reduced even at the ordinary tempera- 

 ture if it has been partly neutralized with the 

 free mineral acids and also decomposes spon- 

 taneously if allowed to stand. It is, therefore, 

 necessary to use a freshly prepared solution. 

 If, however, glycerine and ammonium hy- 

 droxide are used, instead of the tartaric acid 

 salt, a solution is obtained which is perfectly 

 stable. ' Action of the Anhydride of Orthosul- 

 phobenzoic Acid on Dimethyl- and on Diethyl- 

 analine' : By M. D. Sohon. Formation of 

 the corresponding aniline sulphonphthaleins. 

 ' The Molecular "Weight of Lactimide' : By 

 G. M. RiCHAEDSON and M. Adams. The evi- 

 dence speaks in favor of the double formula. 

 ' The Action of Sodium Ethylate upon a, p — 

 Dibromhydrocinnamic Ester, Citradibrompyro- 

 tartaric Ester, and a, /3 — Diorompropionic Es- 

 ter' : By V. L. Leighton. ' On some Bromine 

 Derivatives of 2, 3, — Dimethylbutane' : By 

 H. L. Wheeler. ' Phosphatic Chert' : By 

 J. H. Kastle, J. C. W. Frazer and Geo. 

 Sullivan. Analyses of phosphatic limestone. 

 ' On the Effect of Light on the Combination 

 of Hydrogen and Bromine at High Tempera- 

 tures' : By J. H. Kastle and W. A. Beatty. 

 Light causes the combination of hydrogen and 

 bromine at 196°. 



J. Elliott Gilpin. 



The Zeitschrift fiir den physikalischen und 

 chemischen Unterricht (Berlin, Julius Springer) 

 deserves to be better known than it is by the 

 teachers in our secondary schools. The ten 

 volumes now completed are full of valuable 

 matter bearing upon the teaching of physcial 

 sciences. In the first, January, number of 

 the eleventh volume, the editor. Dr. Poske, 

 reviews the history of the journal, reafBrms 

 strongly his frequently expressed opinion of 

 the humanistic character of all proper general 

 physical instruction, and urges teachers to make 



less of theory and hypothesis and more of ex- 

 periment and experience. Then follow some 

 notes by that wonderfully bright and prolific 

 writer. Professor Mach, of Vienna, one of the 

 associate editors, upon the ' Historical Develop- 

 ment of Optics. ' Dr. Strecker, of Berlin, writes 

 upon theory and practice in the construction of 

 rheostats for small physical laboratories. Then 

 follows an article upon the nature of visible 

 water-vapor and its experimental production 

 before a class. Then we have Professor van't 

 HofF's paper of last summer before the Scientific 

 Congress in Berlin on ' Stereo-chemistry.' De- 

 scriptions of new apparatus and experiments, 

 historical notes, courses and methods of instruc- 

 tion, technics and mechanical praxis, new 

 books, reports of scientific societies, and astron- 

 omy for the year, with maps, complete the 

 volume. 



E. a. Strong. 

 Ypsilanti, Mich. 



NEW BOOKS. 



Legons sur I' integration des equations aux derivees 

 partielles du second ordre a deux variables in- 

 dependantes. E. Goursat. Paris, A. Her- 

 mann. 1898. Vol. II. Pp. 344. 



Peneroplis, eine Studie zur biologisehen Morpho- 

 logie und zur Speciesfrage. Friedrich 

 Dreyee. Leipzig, Wilhelm Engelmann, 

 1898. Pp. vi+119 + 5 plates. 10 Marks. 



Pasteur. Percy Frankland and Mrs. Percy 

 Frankland. New York, The Macmillan Co. 

 Pp. vi+224. $1.25. 



Angewandte Elektrochemie. Franz Peters. 

 Wien, Pest, Leipzig. A. Hartleben's Verlag. 

 Vol. 2. 1st part, pp. xi-|-248; 2nd part, pp. 

 xii+215. 



The Arrangement of Atoms in Space. J. H. 

 Van't Hoff. Second revised and enlarged 

 edition ; translated and edited by Arnold 

 Eilvart. London, New York and Bombay, 

 Longmans, Green & Co. 1898. Pp. vi-|-211. 



Spectrum Analysis. John Landower. Author- 

 ized English Edition by J. Bishop Tingle. 

 New York, John Wiley & Sons ; London, 

 Chapman & Hall, Ltd. 1898. Pp. x+239. 



Outlines of Descriptive Psychology. George 

 Trumbull Ladd. New York, Charles 

 Scribner's Sons. 1898. Pp. xi-f 428. $1.50. 



