96 Baskerville and Lochhart — Radium Emanations. 



It is, there- 



It was learned that tiflanyite diamonds are quite as sensitive 

 to the action of the emanations as the phosphorescent zinc 

 sulphide. We did not have enough diamonds to change for 

 each experiment, so in each trial a strip of Sidot's blende 

 screen was inserted. This served to show that the emanations 

 had beeu condensed. We were much surprised to learn on 

 frequent repetition of the experiment that kunzite, which is so 

 responsive to radium, neither fluoresced nor phosphoresced 

 when the emanations were condensed thereon, 

 fore, responsive to the beta- and gamma-rays only. 



Before giving the results of the observations, which follow 

 in tabulated form, it may be well to relate the results obtained 

 in several experiments, the bearing of which upon the question 

 in mind is apparent. 



The cooling of zinc sulphide to the temperature of liquid 

 air does not cause it to glow, with or without vacuum. A good 

 vacuum and a sudden releasing of the same does not cause zinc 

 sulphide to glow. But warming it to ordinary temperature 

 after removal from liquid air does cause it to glow brilliantly. 

 Chlorophane and kunzite cooled in liquid air show no phos- 

 phorescence. 



Action of emanations from radium chloride (7000 activity) on : 



Mineral. 



Locality. 



Eesult. 



Eemarks. 



With Ultra-Violet 

 Light. 



Wollastonite 



Harrisville, Lewis 

 Co., N. Y. ' 



Slow to phosphor- 

 esce, faint 



Tribo-luminescent 



Phosphorescent 



White wollaston- 



Morelos, Mexico 



Glows brilliantly 



Loses glow in less 



Phosphorescent 



ite (with idocrase 







than five min- 





and pink garnet) 







utes 





Wollastonite 



Franklin Tunnel, 



N. J. 



Glows brilliantly 



Loses glow quick- 



Phosphorescent 



Pectolite 



Havers, N. Y. 



Nothing 





Phosphorescent 



Pectolite 



Paterson, N. J. 



Nothing 





Phosphorescent 



Pectolite 



Guttenburg, N. J. 



Nothing 





Phosphorescent 



Spodumene 



Paris, Me. 



Nothing 





Nothing 



Spodumene (hid- 



Alexander Co., N. 



Nothing 





Nothing 



denite) 



C. 









Spodumene 



U.G., Brazil, S. A. 



Nothing 





Nothing 



Spodumene (kunz- 



Pala, Cal. 



Very slight re- 





Phosphorescent 



ite) 





sponse 







Willemite 



Franklin, N. J. 



Glows well 



Not so sensitive as 

 zinc sulphide, or 

 tiffanyite ; glows 

 with emanations 

 from commercial 

 thorium oxide 



Fluorescent and 

 phosphorescent. 



Greenockite 





Glows strongly 



Goes away quickly 



Fluorescent 



Hyalite 



Yellowstone Park 



Nothing 





Fluorescent 



Colemanite 



Mono Lake 



Nothing 





Phosphorescent 



Chlorophane 



Amherst, Va. 



Nothing 





Phosphorescent 



Tiffanyite 



5 Dutch diamonds, 



Glows very easily 



Lasts several hours 



Phosphorescence 





2& k. 



and brilliantly 





prolonged 



