716 



SCIENCE. 



[N. S. Vol. VIII. No. 203. 



an understanding of the simpler member from 

 which it is derived. A knowledge of the pres- 

 ent conception of the structure of benzene is 

 certainly necessary in order to understand the 

 isomeric compounds and the formation and re- 

 actions of the complex derivatives. The sub- 

 jects are quite fully developed, with charts to 

 illustrate the relationship of substances to one 

 another, and methods of preparation, for use in 

 a laboratory, are given in an appendix, as is 

 also a short review of the general method of 

 testing for the commoner organic substances. 

 The boolj is intended evidently for men prepar- 

 ing for Board examinations. 



J. E. G. 



SCIENTIFIC JOURNALS. 

 The Journal of Physical Chemistry, June: 

 Molecular Weights of Liquids, two papers by 

 Clarence L. Speyers. Benzilorthocarboxylic 

 Acid, by C. A. Soch; a study of the two modi- 

 fications. Analysis of Aqueous Alcohol, by 

 Chester B. Curtis ; the method proposed is 

 titration with toluene until milky turbidity ap- 

 pears. The results are as accurate as the pyc- 

 nometer tests, are simple and rapid. The 

 delicacy of the test increases rapidly with the 

 strength of the alcohol. The Benzoyl Ester of 

 Acethydroxamic Acid, by Frank K. Cameron; 

 a study of the two modifications. Boiling- 

 point Curve for Benzene and Alcohol, by E. F. 

 Thayer. October: Benzaldoxime, by Frank 

 K. Cameron. The Isothermal Pressure-surface 

 in the Case of Two Single Salts and one Double 

 Salt, by F. G. Donnan. The Molecular Weight 

 of Orthorhombic, Monoclinic and Plastic Sul- 

 phur in Naphthalene and Phosphorus by the 

 Freezing-point Method, by Samuel D. Gloss ; 

 from the boiling-point method in carbon disul- 

 fid and in benzene, Orndorif and Terasse con- 

 clude [that orthorhombic and monoclinic sulfur 

 have the same molecular weight ; Blitz by the 

 vapor-density method reaches the same result 

 for orthorhombic and plastic sulfur; the au- 

 thor also concludes from a series of determina- 

 tions by the freezing-point method, using naph- 

 thalene and phosphorus as solvents, that the 

 molecular weights of the three varieties of sul- 

 fur are the same. The Variance of the Vol- 

 taic Cell, by Wilder D. Bancroft ; the object of 



this paper is to show the way in which the 

 phase rule should be applied to reversible cells, 

 and to call attention to the usefulness of the 

 theorem of La Chatelier in predicting the 

 change of the electro-motive force with the 

 change of the parameters. 



The October number of the Bulletin of the 

 American Mathematical Society contains an ac- 

 count of the Fifth Summer Meeting of the So- 

 ciety, by the Secretary: ' Note on the General- 

 ization of Poincar6 and Goursat's Proof of a 

 Theorem of Weierstrass',' by Professor W. F. 

 Osgood ; ' Supplementary Note on a Single 

 Valued Function with a Natural Boundary, 

 whose Inverse is also Single Valued,' by Pro- 

 fessor W. F. Osgood ; ' Note on the Periodic 

 Developments of the Equation of the Center 

 and of the Logarithm of the Radius Vector,' 

 by Professor A. S. Chessin ; ' The Theorems of 

 Oscillation of Sturm and Klein (Third Paper),' 

 by Professor Maxime Bocher ; 'Notes;' and 

 ' New Publications. ' The November number 

 of the Bulletin contains a report on the Cam- 

 bridge Colloquium, by Professor H. S White ; 

 the six lectures on ' Selected Topics in the 

 General Theory of Functions,' delivered before 

 the Colloquium by Professor W. F. Osgood ; a 

 report of the Boston meeting of Section A of 

 the American Association for the Advancement 

 of Science, by Professor James McMahon; 

 ' Notes ;' and ' New Publications.' Each of the 

 two numbers fills 56 pages. 



The American Journal of Science for Novem- 

 ber contains the following : ' Irregular Reflec- 

 tion,' by C. C. Hutchins; 'Occurrence of Sperry- 

 lite in North Carolina,' by W. E. Hidden ; ' De- 

 scription of a Fauna found in the Devonian 

 Black Shale of Eastern Kentucky,' by G. H. 

 Girty ; ' Separation of Nickel and Cobalt by 

 Hydrochloric Acid,' by F. S. Havens; 'Con- 

 tributions to Paleontology,' by F. A. Lucas ; 

 ' Value of Type Specimens and Importance of 

 their Preservation,' by O. C. Marsh ; 'Origin of 

 Mammals,' by O. C. Marsh ; ' Causes of Varia- 

 tion in the Composition of Igneous Rocks,' by 

 T. L. Walker ; ' Relation between Structural 

 and Magneto-optic Rotation,' by A. W. Wright 

 and D. A. Kreider. 



