258 IOWA ACADEMY OF SCIENCE 



Hammer (Eleetr. Rev., 56, 905), Selenium cells. 



McDowell (Phys. Rev., 30, 474-484), Some electrical properties 

 of selenium. 



Luterbacher (Ann. d. Phys.. 33, 1392-1412), The influence of 

 E. M. F. on the resistance of selenium. 



Meier (Ann. d. Phys., 31, 1910, p. 1017), Dispersion and ab- 

 sorption of light by selenium. 



Stebbim (Astro. Phys. Journ.. 32, pp. 125-214), The measure- 

 ment of the light of the stars with a selenium photometer. 



Stebbins (Astro. Phys. Journ., 32, 179-182), The brightness of 

 Halley's comet by a selenium photometer. 



Pelabon (Compt. Rendus, 151, pp. 641-644), Cells of antimony 

 and antimony selenide. 



1911. 



Brown (Phys. Rev., 33, 1-26), The nature of light action in 

 selenium. 



Brown (Phys. Rev., 33, 403-419), The recovery of the Giltay 

 selenium cell and the nature of light action in selenium. 



Brown (Transit, 16, 61), The electrical properties of selenium 

 and their applications. 



Crum (The Elect, Rev. and West. Elect., 58, 433), The electri- 

 cal properties of selenium. 



Glatzel (Phys. Zeits., 12, p. 480, 570 and 1169), The fatigue .of 

 selenium cells. 



Crum (Phys. Rev., 33, 538-548). Light negative selenium. 



Vochettino (Se. Ab., 14, p. 322), Sensitiveness of selenium prep- 

 arations. 



Ries (Ann. d. Phys., 36, 1055), The cause of the light-sensitive- 

 ness of selenium. (Phys. Zeits., 12, 480, 522.) 



Ries (Phys. Zeits., 12. 529), The effect of voltage on the re- 

 sistance of selenium. 



Ries (Ann. d. Phys., 36, 1055-1065), The potential effect in se- 

 lenium and antimonite. 



Stebbins (Astro. Phys. Journ., *33, 395), The radiation of the 

 companion of Algol. 



