November jrd, igo8?[ PROCEEDINGS. vii 



detected. Cameron and Ramsay do not appear to have been 

 aware of the delicacy of the spectroscopic test for neon in air. 

 They mention that it was difficult to avoid a leakage of air into 

 their apparatus, and the amount of leakage in the experiment 

 quoted in their paper is, in our experience, quite sufficient to 

 give a bright spectrum of neon. Consequently, the experiment 

 is quite inadequate to prove the production of neon by the 

 emanation. 



Professor E. Rutherford, F.R.S., read a paper entitled, 

 *' Some Properties of the Radium Emanation." The 

 paper is printed in the JSIemoirs. 



In connection with the reading of the three above- 

 mentioned papers, experiments were shown to illustrate the 

 following phenomena : — 



The fluorescence of a zinc sulphide screen, enclosed in an 

 envelope, and of a crystal of willemite, under the action of 

 the a particles of the emanation. 



The rapidity of condensation of pure emanation contained 

 in an exhausted vessel when one point was cooled to the 

 temperature of liquid air. 



General Meeting, November 17th, 1908, 



Professor H. B. Dixon, M.A., F.R.S., President, 

 in the Chair. 



Mr. Alfred Schwartz, A.K.C, M.Sc.Tech., M.I.E.E., 

 Assoc. M.Inst.C.E., Professor of Electrical Engineering in the 

 School of Technology, Manchester University, was elected an 

 ordinary member of the Society. 



Ordinary Meeting, November 17th, 1908. 



Professor H. B. Dixon, M.A., F.R.S., President, 

 in the Chair. 



The thanks of the members were voted to the donors of the 

 books upon the tables. 



