4 Proceedings of Indiana Academy of Science 



Papers on Chemistrv and Phj'sics — Continued — Page 



Thiocyanotocobaltous Acid and its Alkali Salts: F. J. Allen and 



A. R. Middleton 153 



Evaporation of Solutions and Liquids in Burettes: M. G. Mellon. . . . 159 

 The use of Solutions of Inorganic Salts as Permanent Color Standards: 



M. G. Mellon 164 



An Improved Murexide Test for Teaching Purposes: Samuel E. Earp 173 

 Fog Formation in Air which has passed through a Silent Discharge: 



F. O. Anderegg and K. B. McEachron 175 



An Oscillographic Study of an Induction Coil with High P'requency 



Load: F. O. Anderegg and K. B. McEachron 178 



A Type of Silent Discharge involving Catalysis: F. O. Anderegg and 



E. H. Bowers LSI 



A Further Study of Pressure Reversals in the Corona Discharge: 



F. O. Anderegg 187 



Improved Designs of Sound Condensers: Arthur L. Foley 191 



Locomotive Whistle Experiments: Arthur L. Foley 193 



A Method of Measuring the Amplification of two or more Stage 



Amplifiers: R. R. Ramsey 195 



A Method of Securmg Accurate High Frequency Standard: R. R. 



Ramsey 197 



An Investigation of the Foley Telephone Mouthpiece: James E. Brock 199 



Papers on Biology — 



The Occurrence of Secondary Parasitism in the Frog: George Ze- 



browski 205 



Notes on the Mammals of the Dune Region of Porter County, Indiana: 



Marcus Ward Lyon, Jr 209 



Reactions to Light and Photoreceptors of Lumhricvs terrestris: 



Walter N. Hess 223 



Chromosomal Variations in the Earwig, Aninolabris annuleipcs 



Lucas: W. P. Morgan 225 



A Hygrothermograph Puzzle: W. H. Larrimer 231 



Xagana (Trypuuosomrt brucci): The (bourse of the Disease in Labora- 

 tory Animals when injected with Cultures grown in vivo and in 



vitro: Charles A. Behrens 233 



The Use of Clark and Lubs Indicators for the Detection of Acid 



Production by the Colon-Typhoid Group: P. A. Tetrault 247 



Soil Bacterial Types and Green Manuring: I. L. Baldwin and A. J. 



Smith 253 



A Simple Method of determining the Thermal Death-point: James 



B. Kendrick and Max W. Gardner 257 



Further notes on the Unusual Stipules of Acer nigrum Michx: Flora 



Anderson 259 



Unusual Branching in Cladophora: Flora Anderson 261 



Plants New to Indiana, XI. : C. C. Deam 263 



The Effect of Pressure on Seedlings: F. M. Andrews 265 



Chloroplasts of Mariynia Jraqrans: F. M. Andrews 267 



Quantitative Estimation of Aeration in Leaves: F. M. Andrews. . . . 268 



An Unusual Iris: F. M. Andrews 270 



Second Blooming of Snowball Bush in the Same Year: F. M. Andrews 270 



