244 IOWA ACADEMY OF SCIENCE 



Ross (Phil. Mag., 47, 161). The resistance of selenium. 



HUger (Ann. d. Chem.. 171. 211). Solubility in sulphuric acid. 



187-". 



Adams (Proc. Roy. Soc. 23. 535; and Pogg. Ann., 159, 622), 

 The action of light on selenium. 



(Proc. Roy. Soc., 4, 163: and Pogg. Ann., 159, 629), The 

 action of light on selenium and tellurium. 



Bolls (Phot, News, p. 407, 1875), Photometer. 



Siemens (Berl. Sitz.-Ber. T p. 280; Pogg. Ann., 156, 334), The 

 influence of light on conductivity of selenium. 



Siemens (Dinglers Polytech. Journ.. 217. 61), Electrical pho- 

 tometer. 



1876 



Adams and Day (Proc. Roy. Soc, 23, 539), Action of light on 

 selenium. 



Draper and Moss (Chem. News, 33. 1 and 203), The action of 

 light on the conductivity of selenium. 



Gordon (Jahrs. ber. d. Chem., 121), Action of light on con- 

 ductivity of selenium. 



Siemens (Berl. Akad., Ber., p. 299; and Pogg., 159, 117-141), 

 The effect of light and heat on the conductivity of selenium. 



Moss (Chem. News. 33, 1). Conductivity and light-effect. 



Adams (Proc. Roy. Soc. 24, 163-164; Pogg. Ann., 159, 629), 

 Conductivity and light-effect. 



1877 



Braun (Wied. Ann. 1, 95), Conductivity, Ohms law and light- 

 effect. 



Foi'ssmann (Wied. Ann., 2. 512-521), The conductivity of se- 

 lenium. 



Sit mens (Wied. Ann., 2, 521, 534), The effect of heat and light 

 on conductivity. 



Eggoroff (Journ. Russ. phys. Chem. Ges., p. 304), Experiments 

 with the selenium photophone. 



