CONTEMPORARY ADVANCES IN PHYSICS 655 



devoted in the hope of imparting to free electrons and to protons such 

 values of kinetic energy as heretofore only alpha-particles has pos- 

 sessed. 



Literature 



Cambridge School: 



For the work of Rutherford and his colleagues there is an authoritative summary in 

 the book of Rutherford, Chadwick and Ellis " Radiations from Radioactive Sub- 

 stances" (MacMillan, 1930). Subsequently there has appeared the article by J. 

 Chadwick, J. E. R. Constable and E. C. Pollard, Proc. Roy. Soc, A130, 463-489 

 (1931). The paper of P. M. S. Blackett whence Fig. 10 was taken is in Proc. Roy. 

 Soc, A107, 349-360 (1925). 



Vienna School: 



The work of H. Pettersson and G. Kirsch and their associates at Vienna was de- 

 scribed as of 1925 in the book of Pettersson and Kirsch, " Atomzertriimmerung" 

 (Leipzig, 1926), which was followed three years later by a popular work of Pettersson 

 alone, "Kiinstliche Verwandlung der Elemente" (Berlin, 1929). Among subsequent 

 papers there are the following dealing directly with transmutation: R. Holoubek, 

 Zs.f. Physik, 42, 704-720 (1927); E. A. W. Schmidt, ibid., 721-740; Kirsch and Petters- 

 son, Zs.f. Physik, 51, 669-695 (1928); G. Stetter, Phys. Zs., 30, 812 (1929). There 

 are also numerous papers concerning the methods. Stetter's above-cited measure- 

 ment of charge-to-mass ratio for protons is in Zs.f. Physik, 42, 741-758 (1927). 



Other Schools: 



W. Bothe: Zs. f. Physik, 63, 381-395 (1930). W. Bothe and H. Franz: Zs. /. 



Physik, 43, 456-465 (1927); 49, 1-26 (1928). 

 H. Franz: Zs.f. Physik, 63, 370-380 (1930); Phys. Zs., 30, 810-812 (1929). 

 W. D. Harkins and'R. W. Ryan, /. Am. Chem. Soc, 45, 2095-2107 (1923). 

 W. D. Harkins and H. A. Shadduck, Proc. Nat. Acad. Sci., 2, 707-714 (1926); 



Zs.f. Physik, 50, 97-122 (1928). 

 W. D. Harkins and A. E. Schuh: Phys. Rev., (2) 35, 809-813 (1930). 

 C. Pawlowski: C. R., 191, 658-660 (20 October 1930). 

 H. Pose: Phys. Zs., 30, 780-782 (1929); 31, 943-945 (1930); Zs.f. Physik, 60, 



156-167 (1930); 64, 1-21 (1930); 67, 194-206 (1931). 

 H. C. Urey: Phys. Rev. (2) 37, 923-929 (1931). 



