294 Proceedings at the Meetings. 



The following Communications were made : 



1. A String Electroscope. By T. H. Laby, B.A., Emmanuel 

 College. 



2. Secondary Rontgen Radiation. By J, A. Crowther, B.A., 

 St John's College. (Communicated by Professor Sir J. J. Thomson.) 



3. Interference Fringes with Feeble Light. By G. I. Taylor, B. A., 

 Trinity College. (Communicated by Professor Sir J. J. Thomson.) 



4. The solution of Linear Differential Equations by means of 

 Definite Integrals. By H. Bateman, M.A., Trinity College. 



February 8th, 1909. 

 In the Chemical Laboratory. 



Mr S. Ruhemann, Vice-President, in the Chair. 

 The following were elected Fellows of the Society : 



W. L. Balls, M.A., St John's College. 

 W. H. Harvey, B.A., Christ's College. 

 H. 0. Haslam, M.B., Gonville and Caius College. 



The following Communications were made : 



1. Further studies on Dihydroxymaleic Acid. By Dr Fenton 

 and W. A. R. Wilks, B.A., Gonville and Caius College. 



2. Homologues of Furfural. By Dr Fenton and F. Robinson, 

 B.A., Peterhouse. 



3. Action of Urethane on Esters of Organic Acids and Mustard 

 Oils. By S. Ruhemann, M.A., Gonville and Caius College, and J. G. 

 Priestley. 



4. The absorption spectrum of a solid alkyl derivative of picene. 

 By Miss A. Homer and J. E. Purvis, M.A., St John's College. 



5. The absorption spectra of mesitylene and 3-chloromesitylene. 

 By J. E. Purvis, M.A., St John's College, 



6. The absorption spectra of concentrated and diluted solutions 

 of chlorophyll. By J. E. Purvis, M.A., St John's College. 



7. A coloured thio-oxalate. By H. O. Jones, M.A., Clare College, 

 and H. S. Tasker, B.A., Emmanuel College. 



8. Note on some double Fluorides of Sodium. By W. A. R. 

 Wilks, B.A., Gonville and Caius College. (Communicated by Dr 

 Fenton.) 



9. On a configuration of twenty-seven hyper-planes in four dimen- 

 sional spaces. By W. Burnside, M.A., Pembroke College. 



