xxiv Proceedings. [Jlltrj' 4.tJi, igog. 



Professor E. Knecht, Ph.D., read a paper, written in 

 conjunction with Mr. J. P. Batev, M.Sc.Tech., entitled, 

 "A Modification of the Beckmann Apparatus by which 

 Constant Readings are obtained in determining the 

 Boiling Points of Aqueous Solutions." 



Miss Marie C Stopes, Ph.D., D.Sc, and Mr. C. Gordon 

 Hewitt, M.Sc, read a joint paper, entitled, "On the Tent- 

 building Habits of the Ant, Lasius Niger, Linn., in 

 Japan." 



Professor H. F. Rugan, of Tulane University, U.S.A., 

 read a paper, written in conjunction with Piofessor H. C. H. 

 Carpenter, Ph.D., of Manchester University, entitled, "The 

 Permanent Change of Volume of Cast Irons after 

 repeated Heatings." 



Samples of Iron that had been subjected to repeated heatings 

 were exhibited, and showed very clearly how considerable was 

 the growth that had taken place. 



The first two of these three papers are printed in the 

 Metnoirs. 



