570 



SCIENCE 



[N. S. Vol. XXXVI. No. 930 



new substage, tentatively called the Floyd lime- 

 stone, is added at the base of the Lime Creek 

 stage. 



Some Notes on the Aftonian Mammals: A. O. 



Thomas. 



A number of interesting mammalian bones and 

 teeth have been added to the State University 

 collection during the past year. They are chiefly 

 remains of the elephant, horse and camel. The 

 finding of the lower jaw of a beaver adds a new 

 genus to this remarkable faunal assemblage. 

 Early Iowa Locality Eecords: B. Shimek. 



A discussion of the early Iowa plant, mollusk 

 and insect records in the earlier reports, such as 

 those of the Lewis and Clark, Long, Nicollet and 

 Owen expeditions. Also a discussion of the 

 "Council Bluff," Nebraska, records which are 

 sometimes thought to refer to Council Bluffs, 

 Iowa. 



The Fha-se Difference at the Ears Produced by a 

 Simple Source of Sound: G. W. Stewart. 



A New Laboratory Apparatus for Measuring 

 Time, Independent of ClocJc or Chronograph: 

 F. C. Brown. 



Evidence Favoring the Chemical Disintegration of 

 Sodium as an Element: F. C. Brown. 



The Effect of Mechanical Bupture on the Elec- 

 trical Conductivity of Selenium: F. C. Brown. 



A Method of Determining Whether the Restoring 

 Torque is Proportional to the Torsional Strain 

 during the Vibration of a Torsional Pendulum: 

 L. P. Sieg. 



The Influence of an Electric Cu,rrent upon the 

 Elasticity of Wires: H. L. Dodge. 



A Simple Laboratory Equipment for the Elemen- 

 tary Study of Alternating Currents: H. L. 



On the Dissimilarity of Light and Heat Action in 

 a Certain Variety of Selenium: E. O. Dieterich. 



Mollusca of Iowa: T. Van Hyning. 



A Study in Inject Parasitism: R. L. "Webster. 

 An account of certain insect parasites reared 



from the common tomato-worm, Phlegethontias 



sexta Johanssen, the relations of these parasites to 



the host and to each other, and their comparative 



abundance, etc. 



A Systematic Study of the Meduviidce of North 

 America: S. B. Fracker. 



Notes on a Collection of Mammals from North- 

 western Iowa: Alexander G. Ruthven and Nor- 

 man A. Wood. 



Contributions to the Herpetology of loica — II.: 

 Alexander G. Riithven. 



Food Habits of Bed-tailed HawTc, Cooper's HawTc 

 and Sparrow HawTc: F. C. Pellett. 



The Interpretation of the Cardio-sphygmogram 

 and the Electro-cardiogram, Normal and Patho- 

 logical: W. E. Sanders. 



The Source of the Chromaffine Cells in the Guinea- 

 pig : iMildred E. Yule. 



Notes on the Food of the BlacTc-crowned Night 

 Heron in Captivity: B. H. Bailey. 



The Occurrence of Melanism iji the Broad-winged 

 HawTc: B. H. Bailey. 



A BemarTcable Flight of Broad-winged HawTcs: 

 B. H. Bailey. 



L. S. Ross, 

 Secretary 



SOCIETIES AND ACADEMIES 



THE PHILOSOPHICAL SOCIETY, UNIVERSITY OP VIR- 

 GINIA. MATHEMATICAL AND SCIENTIFIC SECTION 



The first meeting of the session 1912-13 of the 

 Mathematical and Scientific Section was held Sep- 

 tember 23, 8:00 P.M. The following officers were 

 elected : 



CTiairman — Professor Llewelyn G. Hoxton. 



Secretary — Profesor Wm. A. Kepner. 



Publication Committee — Prof essors W. H. Echols, 

 J. L. Newcomb and Thomas L. "Watson. 



The retiring chairman. Professor Thomas L. 

 "Watson, read by title a paper on ' ' Kragerite, a 

 Eutile-bearing Rock from Krageros, Norway." 

 Professor "Watson read a second paper entitled 

 "Vanadium and Chromium in Entile and the Pos- 

 sible Effect of Vanadium on Color." 



Professor R. M. Bird reported observations made 

 along New River, Virginia to North Carolina. 

 "Wm. a. Kepner, 



Secretary 



University of Virginia 



the elisha mitchell scientific society 

 The 200th meeting of the society was held 

 October 15 in Chemistry Hall, University of North 

 Carolina, Professor E. V. Howell presiding. The 

 following new members were elected : Professor 

 H. "W. Chase and IMr. J. S. Holmes. The follow- 

 ing papers were read: 



"Chemical Control of Industrial Plants," by 

 Dr. C. H. Herty. 



' ' The "Water Molds of Chapel Hill, ' ' by Dr. "W. 

 C. Coker. 



James M. Bell, 

 Becording Secretary 

 Chapel Hill, N. C. 



