Optical Properties. 



ii: 



7300 



Dessau, B. Neues von den Rontgen- 

 und Becquerelstrahlen. Umschau, 

 Frankfurt a. M., 7, 1903, (429-434). 



Helbig. Neiie Strahlen. Pharm. 

 Centralhalle, Dresden, 44, 1903, (885- 

 889). 



McClung, R. K. The effect of tem- 

 perature on the ionisation jjrodaced in 

 gases [air, carbon dioxide and hydrogen] 

 bv the action of Rontgen ravs. Phil. 

 Jlag., London, (Ser. 6), 7, 1904, (81-95). 



The relative amount of 



ionization produced in gases by Rontgen 

 ravs of different types. Phil. Mas?., 

 London, (Ser. 6), 8, 1904, (357-373). 



Scbaum, Karl. Ueber Elektrolyse 

 durch Becquerelstralilen. ilarburg, 

 SitzBer. Ges. Natw , 1904, (42-13). 



Szilard, Bela. (Jber chemische Er- 

 klarung der Triboluminescenz. 



(Ungarisch) Magv. Chem. F., Budapest, 

 10, 1904, (157). 



t)ber die clieinische Wir- 



kuug der Kathod- und Rohrenstrahlen. 

 (Ungarisch) Magv. Chem. F., Budapest, 

 10, 1904, (107-lf38, 121-124J. 



Radium emanations. 



Ackroyd, William. The action of 

 radium rays on the halides of the alkali 

 metals and analogous heat effects. 

 London, J. Chem. Soc, 85, 1904, (812- 

 817); [abstract] London, Proc. Chem. 

 Soc, 20, 1904, (108). 



Experiments and observa- 

 tions with radium compounds. London, 

 Rep. Brit. Ass., 1903, 1904, (039-640). 



Allan, S. J. liadioactivity of the 

 atmosphere. Phil. Mag., London, (Ser. 

 6;, 7, (140-150). 



Auerbach, Friedrich, Radioakti- 

 vitat. Zs. Elektroch., Halle, 10, 1904, 

 (123-120). 



Baskerville, Charles. Thorium , 

 carolinium, berzeliuni. J. Amer. Chem. 

 Soc, Easton, Pa., 26, 1904, (922-942). 



and Kunz, Ceorge F. 



Effects on rare earth oxides produced 

 1)y radium-barium compounds and on 

 the production of permanently luminous 

 preparations by mixing the latter with 

 powdered minerals. Amer. J. Sci.. New 

 Haven, Conn., (Ser. 4), 17, 1904. HU- 

 SO). 



Battelli, A. und Maccarone, F. Sind 

 radioaktive Emanationen elektrisch? 

 (L'ebers.) Phvsik. Zs., Leipzig, 6, 1905, 

 (161-163). 



Becker, A. Unsere gegenwartigeu 

 Kenntnisse iiber Radioaktivitat. Natw. 

 Wochenschr., Jena, 19, 1904, (993-999, 

 1012-1010). 



Becquerel, Henri. Ueber die von der 

 Strahhmg radioaktiver Korper hervor- 

 gerufene sekundare Strahlung. Phvsik. 

 Zs., Leipzig, 5, 1904, (51! 1-563). 



Beilby, G. T. Intensification of 

 chemical action by the emanations 

 from gold and platinum. London, Rep. 

 Brit. Ass., 1903, 1904, (539-540). 



Boltwood, Bertram B. On the i-adio- 

 activitv of natural waters. Amer. J. Sci., 

 New Haven, Conn., (Ser. 4), 18, 1904, 

 (378-387, with text-fig.). 



Borgmann, I. I. Elektrisierung eines 

 isolierten metallischen Leiters durch 

 eineu ihn umgebenden Metall-Cylinder, 

 der geerdet und von dem zu untersu- 

 chenden Leiter durch Luft getrennt 

 ist. Phvsik. Zs., Leipzig, 5, 1904, 

 (542-546). 



Wirkung des Radiums. 



[Elektrisches Nachleuchten, Phospho- 

 reszeuz.] Physik. Zs., Leipzig, 5, 1904, 

 I'lOl-lOC)). 



Bragg, W. H. On the absorption of 

 a rays ; and on the classification of the 

 a ravs from radium. Phil. Mag., 

 London, (.Ser. 6), 8, 1904, (719-725, 

 with pL). 



and Kleeman, R. On the 



ionization curves of radium. Phil. 

 Mag., London, (Ser. 0), 8, 1901, (726- 



lo6}. 



Brooks, IL, Mi.-<s. The decay of the 

 excited radioactivity from thorium, 

 radium and actiniiun. Phil. Mau., 

 Lnndon, (.Srr. 6), 8, 1904, (373-384). 



Bumstead, H. A. Atmospheric radio- 

 activity. Amer. J. Sci., New Haven, 

 Conn.,' (.Ser. 4), 18, 1901, (ri]-ll, with 

 text-lig.). 



Atmospharische Railio- 



aktivitiit. [Uebersetzung.J Phvsik. Zs., 

 Leipzig, 5, 1904, (.504-.509). 



-and Wheeler, L. P. On 



the projierties of a radio-active gas 

 lound in the soil and water near New 

 Haven. [Due to presence of Kidiuni.] 



