952 



SCIENCE 



[N. S. Vol XLI. No. 1069 



should obtain in the case of interaural conduction, 

 we have a curve which is far from a straight line. 

 After much consideration of theories involving 

 interaural conduction, none seems to be in agree- 

 ment with the evidence here shown. 



The Absence of Liberation or Absorption of Elec- 

 trons During a Change from the Conducting to 

 the Non-conducting State: L. E. Dodd. 

 Crystals of metallic selenium were melted in a 

 metallic cup attached to a sensitive electroscope. 

 The heating agent was a focus of sun's rays sup- 

 plied by a convex lens; this method of applying 

 heat was used in preference to flames, which pos- 

 sess high ionizing powers. Previous to the change 

 of state of the selenium the electroscope was given 

 a negative charge. During the time required for 

 the change of state a certain deflection of the 

 electroscope leaf was observed. With the crystals 

 removed from the cup, and the sun's rays focused 

 at the same point as before, two comparison read- 

 ings were made over time intervals equal to that 

 required for the change of state. Changes of de- 

 flection resulted of similar magnitude to that first 

 observed. 



The experimental conclusion is that in metallic 

 selenium, when it changes by melting from the 

 crystalline and conducting form to the amorphous 

 and insulating form, electrons axe neither absorbed 

 from, nor liberated to, the surrounding medium, 

 in any very appreciable amount. 



The Crystal Optiphone in its Adaptation to En- 

 able the Blind to Bead the Printed Page 

 through Ear Impressions: F. C. Brown. 



Tlie Variation, with Temperature, of the Light- 

 sensitiveness of Selenium Crystals: Kathkyn J. 



DiETEEICH. 



The Wave-length Sensibility Curves of Selenium 



BlocTcs: E. O. Dieterioh. 

 Psychology Applied to the Improvement of Control 



of the Fitch of the Voice in Singing: Carl J. 



Knock. Introduced by C. E. Seashore. 

 Psychology Applied to Measurement of Merit in 



Advertisements: Harry H. Gould. Introduced 



by C. E. Seashore. 

 The Psychogram in Vocational Guidance: C. E. 



A Bacteriological Study of the Wells of Toledo, 

 Iowa: W. H. Lauderdale and L. A. Kenoyer. 



Preliminary Notes on the Animal Ecology of John- 

 son County: D. M. Brumpiel. Introduced by 

 Gilbert L. Houser. 

 This paper is based on an early spring survey 



of the forms of animal life found in a small 

 stream. The rapids and pools are discussed with a 

 division of the species into particular animal as- 

 sociations. The species have been catalogued with 

 brief notes as to habits and a table has been pre- 

 pared giving in concrete form the distribution, 

 food habits and relative abundance of each spe- 

 cies. 

 On the Lymphatic System of the Common Bat 



(Epimyus norvegicus) : Thesle T. Job. 



From fifty injected specimens, the gross anat- 

 omy of the common rat has been studied and out- 

 lined. The results of the work have further proven 

 the studies of McClure and Silvester on the lym- 

 phatico-venous communications in the jugulo-sub- 

 clavian district, and of Silvester on the renal vein 

 communications, and have established two addi- 

 tional communications, the portal vein connection 

 and the ilio-lumbar vein connection. The main 

 circulation and disposition of the lymphatic sys- 

 tem has been determined and the need of further 

 knowledge concerning the histology of the lymph 

 nodes, of which there appear to be two types, is 

 pointed out. 



Notes on the Development of the Lymphatic Sys- 

 tem of Turtles: Frank A. Stromsten. 

 The Present Status of the Hessian Fly in Iowa: 



E. L. Webster. 

 Tracheal Capillaries of the Grasshopper: L. S. 



Ross. 

 The Inheritance of Eertility in Swine: Edward 



N. Wentworth. 

 Is the Appetite of Swine a Beliable Indication of 



Physiological Needs? John M. Eward. 

 Notes on Iowa Pentatomoidea: Dayton Stoneb. 

 The Crow: Fred Bebninghausen. 

 On Snalces "Swallowing" Their Young: E. D. 



Ball. 



A common garter snake was frequently seen to 

 ' ' swallow ' ' her young. The little snakes would 

 often push their heads out of the mother's mouth 

 and thrust out their little tongues. 

 The Building and Function, of the College Museum: 



B. H. Bailey. 

 Notes on the Distribution of the Prairie Spotted 



ShunTs in Iowa: B. H. Bailey. 

 Ictinia Mississippiensis in NebrasTca: B. H. 



Bailey. 



Published in full in the Wilson Bulletin of Ober- 

 lin College. 



James H. Lees, 



Secretary 



