896 



SCIENCE 



[N. S. Vol. XLIV. No. 1147 



tram of Mercury," by T. C. Hebb, University of 

 Chicago. 



"Note on the Single-lined and the Many-lined 

 Spectrum of Mercury," by R. A. Millikan, Uni- 

 versity of Chicago. 



"The Structure of the Bismuth Line at Wave- 

 length 4722," by Henry G. Gale and Lester Aron- 

 berg, University of Chicago. 



"Visual Diffusivity, " by Herbert E. Ives, 

 United Gas Improvement Co., Philadelphia. 



"Measurement of Wave-lengths with the X-ray 

 Spectrometer," by Elmer Dershem, State Univer- 

 sity of Iowa. 



"A Single Bar and Yoke Method for the Mag- 

 netic Testing of Iron Bars," by Arthur Whit- 

 more Smith, University of Michigan. 



"Some Effects of Cross-Magnetizing Eields on 

 Hysteresis," by N. H. Williams, University of 

 Michigan. 



"A. C. and D. C. Corona in Hydrogen, ' ' by John 

 W. Davis, University of Illinois. 



"The Magnetic Properties of Fe, Ni and Co 

 above the Curie Point, and Keesom's Theory of 

 Magnetization," by Earle M. Terry, University 

 of Wisconsin. 



"A Simple Method for determining the Audi- 

 bility Current of a Telephone Receiver," by Ed- 

 ward W. Washburn, University of Illinois. 



"An Extension of the Mayer Experiments," by 

 R. R. Ramsey, Indiana University. 



"The Derivation of the Retarded Potentials," 

 by Max Mason, University of Wisconsin. 



"The Mass of the Electric Carrier in Copper, 

 Silver and Aluminium," by Richard C. Tolman 

 and T. Dale Stewart, University of Illinois. 



"An Experimental and Theoretical Investiga- 

 tion of Binaural Beats," by G. W. Stewart, State 

 University of Iowa. 



"Contact Electro-motive Forces and the Energy 

 of Emission of Electrons under the Influence of 

 Monochromatic Light," by R. A. Millikan, Uni- 

 versity of Chicago. 



"The Permanence of the Wave-length Sensibil- 

 ity Characteristics of Photo-electric Cells," by 

 Herbert E. Ives, United Gas Improvement Co., 

 Philadelphia. 



"Ari Effect of Light on the Contact Potential 

 of Selenium and Cuprous Oxide, " by E. H. Ken- 

 nard and E. 0. Dieterich, University of Minnesota. 



"A Peculiar Gas-Crystal Resistance Change in 

 Selenium, ' ' by W. E. Tisdale, State University of 

 Iowa. 



' ' The Variation in the blackening of a Photo- 

 nic Plate with Time of Exposure, Total 



Energy Remaining Constant," by P. S. Helmick,, 

 State University of Iowa. 



"Note on the Ionizing Potential of Metallic 

 Vapors," by H. J. van der Bijl, New York City. 



A. D. Cole, 

 Secretary 



THE BIOLOGICAL SOCIETY OF WASHINGTON 



The 558th meeting of the society was held in 

 the Assembly Hall of the Cosmos Club, Saturday, 

 October 21, 1916, called to order at 8.10 by Presi- 

 dent Hay, with 50 persons in attendance. 



The president announced the death of Professor 

 F. E. L. Beal, a member of the society, distin- 

 guished for his work in economic ornithology. 



On recommendation of the council Mrs. Ella M. 

 Enlows was elected to active membership. 



Under the heading brief notes, exhibition of 

 specimens, the following informal communications 

 were presented: 



Mr. A. L. Quaintance called attention to a new 

 peach pest (related to the coddling moth), lately 

 found in the District of Columbia and immediate 

 vicinity. These remarks were illustrated by lan- 

 tern-slide views of the insect and its work. 



Dr. C. W. Stiles commented on zoological nom- 

 enclature and gave notice that it was the intention 

 to set aside the rules of strict priority with refer- 

 ence to Bolothuria and Physalia and to use these 

 terms for the animals to which they are currently 

 applied in the usual text-books. 



Dr. Stiles also commented on recent cases in 

 which trichina had figured in certain lawsuits. He 

 expressed the view that with the purchase of meat 

 products went the requirement that the product 

 should be properly cared for and that in the case 

 of pork this care required cooking before con- 

 sumption. It was somewhat unfair to hold the 

 seller of trichinous meat entirely responsible. 



Dr. L. O. Howard cited an instance in which a 

 cockroach was figuring in a lawsuit. A man was 

 suing a Texas railroad for damages on the ground 

 that typhoid fever had been contracted through 

 his drinking pop which had been contaminated by 

 a cockroach, which had apparently been in the 

 bottle before the man drank the pop purchased of 

 the common carrier. 



The regular program consisted of an illustrated 

 lecture by Dr. Paul Bartsch : ' ' Mollusk Collecting in 

 the Philippines. ' ' Dr. Bartsch reviewed the work 

 of previous collectors, gave an account of his own 

 collecting expedition, describing the methods and 

 apparatus used; he spoke of mollusks as a source 

 of food for the natives, their method of gathering 



