466 Baskerville — Ultra- Violet Light tipon Earth Oxides. 



In view of tlie fact tbat tliese two earths give this charac- 

 teristic response to ultra-violet light, it became immediately of 

 interest to learn the effect of the liglit upon minerals carrying 

 those substances in di-fferent .proportions. The following min- 

 erals were subjected to the action of ultra-violet light without 

 a single one of them giving either fluorescence. or phosphor- 

 escence : 



Samakskite, Berthier Co., Que. 

 Thorite (Orangite), Arendal, Norway. 

 " Barkevik, Norway. 



" (Auerlite), Green Kiver, N. C. 



SiPYLiTE, Amherst Co., Ya. 

 CoLUMBiTE, Portland, Conn. 

 MoNAziTE, Arendal, Norway. 



'' Zlatoust, Ural. 



" 171st St. and Waslm. Ave., New York. 



" Amelia C. H., Ya. 



Alexander Co., N. C. 

 Monazite sand. Bio, Brazil, 

 MoNAziTE, Tyedestrand, Norway. 

 Xenotime, Cheyenne Canyou, Colo. 



" Alexander Co., N. C. 



" Hitteroe, Norway. 



EuxENiTE (in Samarskite), Mitchell Co., N. C. 

 Aeschynite, Hitteroe, Norway. 

 PoLYCRASE, nr. Marietta, S. C. 

 Feegusonite, Llano Co., Texas. 

 " Ytterby, Sweden. 



The extended investigation of the action of ultra-violet light 

 upon minerals carried out by Dr. Geo. F. Kunz and the writer 

 will shortly be published in full. 



University of North. Carolina, Sept. loth, 1903. ? 



