40. 
41. 
45. 
44. 
46. 
47. 
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49. 
50. 
. A Student Photographic Spectometer, 5 min., 
LSPS 5, Tekan ae eck ae a en epee Wi eee EKpwin Morrison 
. An Experimental Determination of the Velocity of Sound 
Waves of Different Intensities, 10 min., lantern..ArTHUR L. FotEy 
A Simple Method of Harmonizing Leyden Jar Discharges, 
PRT POGUE Soc RNR EEE Bg 00: Mee ON se at SOS nce ArtTHuR L. Foury 
An Electroscope for Measuring the Radioacticity of Soils, 
OS mins wlamibenn:. <0, 5. caster eens) oe ener R. R. Ramsey 
2. Some Photographs of Explosions in a Gas, 10 min., 
emnitierrete Ae eek he eee ene SM pice ich Delt (Sia Joun B. Dutcumr 
The Cause of the Variation in the Emanation Content of Spring 
Wiktar uO\ names tenants myc tlc ciate urate = aun ands R. R. Ramsry 
A Standard Condenser of Small Capacity, 10 min., 
Ja peRE = 7 ta Re A Te oe NG coat ened re R. R. Ramsey 
5. A Comparison of Calculated and Experimental Radii of the 
Ring System by Diffraction and an Extension of Lommel’s 
Work in Diffraction, 10 min., lantern.......... Mason E. Hurrorp 
SOILS 
Rate of Humification of Manures, 15 min................ R. H. Carr 
ZOOLOGY 
An Instance of Division by Constriction in the Sea-Anemone, 
HAUCGELI ICIS: — 6. MINE eas. sR. Fete epee. Phe Pee Donatp W. Davis 
Data on the Food of Nestling Birds, 15 min. 
Witit Scorr and H. KE. EnpEers 
Two New Mutations and Their Bearing on the Question of 
Multiple Allelomorphs, 5 min................ Rosconm R. Hype 
A Study of the Oxygenless Region of Center Lake, 10 min 
Witt Scorr and H. G. Imeu 
. The Lakes of the Tippecanoe Basin.................... WILL Scorr 
