RADIOACTIVITY A FACTOR OF PLANT ENVIRONMENT 4I 



123. Sury, J. von. Ueber die Radioaktivitiit einiger Schweizerischer 



Mineralquellen. Chem. Centrlb. V. 11': 12S2. 1907. Mitteil. 

 Naturforsch. Ges., Freiburg (Schweiz) Chem. 2: 169. 1906. 

 Dissertation, Freiburg, 1906 (not seen), reviewed in Arch. Sci. 

 Pliys. Nat. 24: loi. 1907. 



124. . [Radioactivite de quelques sources min6rales suisses.] Dis- 

 sertation, Freiburg, 1906. Rev. in Arch. Sci. Phys. Nat. 24: loi. 

 1907. 



125. Thomson, J. J. On some of the consequences of the emission of 



negatively electrified corpuscles by hot bodies. Phil. Mag. VI. 4: 

 253. 1902. 



126. . Experiments on induced radioactivity in air, and on electrical 



conductivity produced in gases when they pass through water. Phil. 

 Mag. VI. 4: 352. 1902. 



127. . Radio-activity of ordinary materials. Nature 67 : 391. 1903. 



128. . Radio-active gas from tap-water. Nature 68 : 90. 1903. 



129. ■ . On the existence of a radio-active gas in the Cambridge tap- 



water. Proc. Cambridge Phil. Soc. 12: 172. 1903. 



130. . On the presence of radio-active matter in ordinary substances. 



Proc. Cambridge Phil. Soc. 12: 391. 1904. 



131. . Electrification produced by heating salts. Proc. Cambridge 



Phil. Soc. 14: 105. 1907. 



132. Tommasina, T. Constatation d'une radioactivite propre aus etres 



vivants, vegetaux et animaux. Compt. Rend. Acad. Sci. Paris 139: 

 730. 1904. 



133. . Die Radioaktivitat der Lava des letzten Vesuvausbruches 



(1904). Physikal. Zeits. 6 : 707. 1905. 



134. Townsend, J. S. The diffusion of ions in air by the action of a 



radio-active substance, ultra-violet light, and point discharges. 

 Proc. Roy. Soc. London 67: 122. 1900. 



135. Traubenberg, H. F. R. von. Ueber die elektrische Zerstreuung am 



Vesuv. Physikal. Zeits. 4 : 460. 1903. 



136. Villard, P. Sur I'aurore boreale. Compt. Rend. Acad. Sci. Paris 



143:143. 1906. 



137. Vincentini, G. Studio della radioattivita dei prodotti delle sorgenti 



termali euganee. Nota preliminare. Venezia, Ferrari, 1904, p. 3. 

 (Not seen.) 



138. & Da Zara, L. Studio sulla radioattivita dei prodotti delle 



sorgenti termali euganee. Atti dei Reale Istit. Veneto di Sci. Lett. 

 Arti64:95. 1905. 



139. Wilson, C. T. R. On the comparative efficiency as condensation 



nuclei of positively and negatively charged ions. (Abstract.) 

 Proc. Roy. Soc. London 65: 289. 1899. 



