Apeil 5, 1907] 



SCIENCE 



535 



so that in the first quarter second of open- 

 ing the final isothermal pressure p^ (cham- 

 bers communicating) is already reached to 

 more than 60 per cent., and my smallest 

 fog chamber holds over 6 liters. One nat- 

 urally asks whether the importance of this 

 in its bearing on the measurements of the 

 ratio of specific heats k/c, has ever been 

 adequately appreciated. 



Fluorescence Absorption: E. L. Nichols 

 and Ernest Merritt, Cornell University. 



Energy Necessary to Ionize a Molecule iy 

 Impact of Negative Electrons: Bergen 

 Davis, Columbia University. 



The Transformation into an Electric Cur- 

 rent of Radiation Incident on a Moving 

 Surface: Bergen Davis, Columbia Uni- 

 versity. 



The Standard Cell: F. A. Wolff and C. E. 

 Waters, Bureau of Standards. 



The Equilibrium of Mercurov^ Sulphate 

 and Mercury and Cadmium Sulphate: 

 F. A. Wolff and C. E. Waters, Bureau 

 of Standards. 



The Distribution of Energy emitted by a 

 Vibrator: C. R. Fountain. 



The Constants in Gas-viscosity: Willakd 

 J. Fisher, Cornell University. 



Production of Radium by Actinium: Ber- 

 tram B. BOLTWOOD. 



Production of Radium from Actiniumr: 

 E. Rutherford. 



The Influence of Electrical Fields upon 

 Spectral Lines: G. F. Hull, Dartmouth 

 College. 



Helion, a New Incandescent Lamp Fila- 

 ment: H. C. Parker and W. G. Clark. 



The Magnetic Rotation of Sodium Vapor 

 at the D lines: R. W. Wood. 



Flourescence Spectra of Mercury Vapor: 

 R. W. Wood. 



Hydraulic Analogy of the Welsbach Man- 

 tle and other Radiators: R. W. Wood. 



The Shielding of a Highly Sensiti/ve 

 Galvanometer: E. P. Nichols and S. R. 

 Williams. 



On the Temperature of the Mercury Arc: 

 Charles T. Knipp. 



A Study of the Reversible Pendulum: 

 John C. Shedd and James A. Birchbt. 



Wave-metrical Measurements with Wire- 

 less Telegraph Circuits: G. W. Piercb. 



The Electrical Properties of Carborundum: 

 G. W. Pierce. 



Dayton C. Miller, 

 Secretary of Section B 



SCIENTIFIC BOOKS 

 Qualitative Analysis as a Laboratory Basis 

 for the Study of General Inorganic Chem- 

 istry. By William Conger Morgan, Ph.D. 

 (Yale), Assistant Professor of Chemistry in 

 the University of California. New York, 

 The Macmillan Company; London, Mac- 

 millan & Co., Ltd. 1906. Pp. xiv + 351. 

 That the last word as to the best method of 

 teaching chemistry has not yet been spoken ia 

 evidenced by the number of new text-books in 

 general and analytical chemistry. Such a mul- 

 tiplicity of new books may be from a financial 

 standpoint unsatisfactory to authors and pub- 

 lishers, but it reveals an activity and healthy 

 independence on the part of teachers of chem- 

 istry. Most if not all these books are written, 

 not to sell, but to bring out the writer's views 

 for his own classes. 



The latest book on qualitative analysis is 

 that by Dr. Morgan, and is to some extent 

 along new lines. Most teachers of chemistry 

 in colleges are confronted with a difficulty 

 arising from the chemistry of fitting schools. 

 Comparatively few students present them- 

 selves for entrance to college well grounded in 

 general chemistry, especially as viewed from 

 the modern physical chemical standpoint, and 

 yet these men are too advanced to be put in a 

 class which is open to beginners. They have 



