254 IOWA ACADEMY OP SCIENCE 



Korn (Compt, Rend., 143, 892). An apparatus for measuring 

 the inertia of selenium cells. 



Berndt ("Weltall, Berlin, 6, 210), Making and mounting of se- 

 lenium cells. 



1906. 



Bronk (Phys. Zeits., 7, 281, and p. 431), Announcement on the 

 selenium cells. 



Coste (Beibl. z. d. Ann. d. Phys., 32, 96), The electrical con- 

 ductivity of selenium. 



Giltaij (Beibl. z. d. Ann. d. Phys., 31, 845), The use of selen- 

 ium cells in double telephony. 



Marc (Zeits. f. Anorg. Chem., 48, 393), The effect of light, 



Marc (Ber. d. Deutsch. Chem. Ges., 39, 697), Knowledge about 

 the allotropic forms of selenium. 



Pochettino and Trabacclii. (Beibl. z. d. Ann., 32, 93), The effect 

 of alternating currents on selenium. 



Reingamim (Phys. Zeits.. 7, 430), A new form of selenium 

 cells. 



Ruhmer (Phys. Zeits., 7, 430), Announcement on selenium cells. 



Schrott (Phys. Zeits., 8, 42), The effect of heat and light on 

 the allotropic forms of selenium. 



Sicphan (Mechaniker, 14, 159 and 173), Construction of a dis- 

 tance photography machine. 



Torda, (Electrician, 56, 1042), Selenium photometer. 



Vogler (Mechaniker, 14, 147), A new arrangement of selenium 

 cells. 



1907. 



Bidwell (Nature, 76, 444), Practical telephotography. 



Bidwell (Nature, 77, 222), The photoelectric properties of se- 

 lenium. 



Brown (Phys. Rev., 25, 505), The effect of radium rays on 

 selenium. 



Glatzel (Deutsch. Median. Zeit., 18, and Verkehrsteehn. Woche, 

 1907, 45), Selenium and its use in distance photography. 



TIaub (Mechaniker, p. 75), A new selenium photometer. 



