viii. Proceedings. [November ijth, 1921. 



till in' Justinian's time the eggs were brought to Europe — the 

 central fact in the history of silk. 



General Meeting, November 15th, 192 1. 



Mr. R. L. Taylor, F.C.S., F.I.C. (Vice-President), in the Chair. 

 The following were elected Ordinary Members of the Society : 



Arthur Pidd Greenhow, Merchant, Field Side, Grange Road, Bowdon, 

 Cheshire. F. C. Thompson, B.Sc. (London), D.Met. (Sheffield), Professor 

 of Metallurgy and Metallography. The University, Manchester. 

 D. C. Henry, B.A. (Cambridge), Lecturer in Chemistry. The Univer- 

 sity, Manchester. 



Ordinary Meeting, November 15th, 192 1. 



Mr. R. L. Taylor, F.C.S., F.I.C. [Vice-President), in the Chair. 



Mr. Taylor referred sympathetically to the death, on Novem- 

 ber 13th, of Professor A. vSheridan Delepine, M.B., CM., M.Sc. 

 Professor Delepine had been a Member of the Society for 27 

 years. 



A vote of thanks was passed to the donors of the books upon 

 the table. 



Professor vSydney Chapman, M.A., D.vSc, F.R.S., read a paper 

 entitled : — 



"On Certain Integrals occuring in the Kinetic Theory 

 of Gases." 



This paper is printed in the Memoirs. 



Mr. J. E. Jones, M.Sc, read a paper entitled : — 



" The Dynamics of Collision of Diatomic Molecules." 



Since Maxwell first propounded the Kinetic Theory of a Gas, 

 considerable evidence has accumulated in support of his 

 hypothesis that a gas, even in a steady state, consists of mole- 

 cules in a continual state of agitation. By the application of 

 the theory, it has been found possible to predict at least two 

 important physical phenomena, which have subsequently been 

 verified experimentally. All the work which has been done up 

 to now has, however, been restricted to the case of a monatomic 

 gas, that is, one in which the molecules possess perfect sym- 



