842 



SCIENCE 



[N. S. Vol. XLI. No. 1066 



' ' Factors Governmg the Darkening of a Photo- 

 graphic Plate by X-rays," by J. S. Shearer. 



"The Wave-length Sensibility Curve for leo- 

 lated Crystals of Selenium between 200 /i^ and 

 450 iJ^fi, " by L. P. Sieg and F. C. Brown. 



"The Variation of Equilibrium Conductivity of 

 Selenium with the Intensity of Illumination," by 

 F. C. Brown. 



' ' The Effect of Variation of Temperature on 

 the Coefficient of Recombination of Electrons in 

 Selenium Crystals," by Kathryn J. Dietreieh. 



Saturday, 2 P.M. 



"A Null Method with Photo-electric Cells," by 

 F. K. Richtmyer. 



"New Testa of Einstein's Photo-electric Equa- 

 tion," by R. A. MiUikan. 



"Factors Affecting the Relation between Il- 

 lumination and Photo-electric Current," by Her- 

 bert E. Ives, Saul Bushman and E. Karrer. 



"The Theory of Adsorption," by Irving Lang- 

 muir. 



"The Law of Stokes and the Removal of Par- 

 ticles from Fluids," by W. W. Strong. 



"Ionization Potential of an X-ray Tube," by 

 E. C. Brew. (Introduced by Horace C. Richards.) 



"Parson's Magneton Theory of Atomic Struc- 

 ture," by Bavid L. Webster. 



"A Conducting Paint," by M. James. 



"Mechanical Strain and Thermo-electric 

 Power," by Walter P. White. 



"Recent Results and Conclusions Regarding 

 Specific Heats at Moderate and High Tempera- 

 tures," by Walter P. White. (By title.) 



"Geometrical Tripods and Stands," by Lyman 

 J. Briggs. 



"Changes in Electrical Resistance Accompany- 

 ing Thermal Expansion," by Arthur W. Gray. 



"The Ballistic Use of a Moving Coil Galvan- 

 ometer in Measuring Discharges Obeying the Ex- 

 ponential Becay Law, " by A. G. Worthing. 



' ' The Mobilities of Ions in Air, " by E. M. Wel- 

 lisch. 



"The Effect of a Magnetic Field on the Initial 

 Recombination of the Ions Produced by X-rays," 

 by J. B. M. Jauncey. (By title.) 



"An Accurate Method for the Measurement of 

 the Conductivity of Electrolytes, " by W. A. Tay- 

 lor and H. L. Curtis. (By title.) 



The thanks of the society were extended to the 

 Washington members for the lunch generously pro- 

 vided on Saturday for all visiting physicists and 

 to the Bureau of Standards for numerous cour- 

 tesies extended. 



On Friday evening a large number of the mem- 

 bers in attendance dined together at the Cosmos 

 Club. This pleasant feature was arranged for and 

 carried out by Dr. L. J. Briggs of the Bureau of 

 Plant Industry. 



The attendance at all sessions was good, and 

 there was considerable profitable discussion of 

 papers. On account of the length of the program, 

 a number of local members courteously yielded 

 their time to others and presented their papers by 

 title only. 



A. D. Cole, 

 Secretary 



TEE ENTOMOLOGICAL SOCIETY OF 

 AMERICA 



The ninth annual meeting of the Entomological 

 Society of America was held at the University of 

 Pennsylvania on December 31, 1914, and January 

 1, 1915, in affiliation with the American Associa- 

 tion for the Advancement of Science. The meet- 

 ings were all well attended, but from the shortness 

 of the time and the amount of business to be 

 transacted several papers had to be read by title. 



The annual public address was delivered on 

 Wednesday evening, December 30, at the Academy 

 of Natural Sciences by Professor Stephen A. 

 Forbes, of the University of Illinois, on the sub- 

 ject: "Ecological Foundations of Applied Ento- 

 mology. ' ' At the same meeting Dr. Henry 

 Skinner, of the Academy of Natural Sciences, gave 

 "A History of the Entomological Society of 

 America." The visiting entomologists were en- 

 tertained by the local entomologists at a smoker 

 after the addresses. 



The following papers were presented: 



"Food Habits of Some Colorado Aphids," by 

 C. P. Gillette. 



"The Poison Glands of Automeris io Fabr.," 

 by Cornelia F. Kephart. 



"Geographical Distribution of Neuropteroid 

 Insects, together with Analysis of Our Insect 

 Fauna," by Nathan Banks. 



' ' The Biology of Nymphula maculalis Clemens, ' ' 

 by Paul S. Welch. Read by title. 



"Modification of Tiger-beetle Colors by Tem- 

 perature and Moisture," by V. E. Shelf ord. 



"Life-history, Development and Work of Un- 

 spotted Tentiform Leaf -miner of Apple," by L. 

 Haseman. Read by title. 



"Pupal Characters Used in the Classification 

 of the Sphingidaj," by Edna Mosher. Presented 

 by the secretary. 



