1890.] on Foam. 97 



motion, and it is only in virtue of such a force that a film can have 

 durability. The main difference between a material that will foam 

 and one that will not is in the liability of the surface to contamination 

 from the interior. 



I find my subject too long for my time, and must ask you to 

 excuse the hasty explanations 1 have given at some parts. But I was 

 anxious above all to show the principal experiments upon which are 

 based the views that I have been led to entertain. 



[Eayleigh.] 



GENERAL MONTHLY MEETING, 



Monday, April 7, 1890. 



Sir James Cbichton Browne, M.D. LL.D. F.R.S. Treasurer and 

 Vice-President, in the Chair. 



Arthur Edward Ash, Esq. 



Kobert Dobbie, Esq. 



William S. Hall, Esq. 



Major Percy A. Macmahon, R.A. 



Miss May Pollock, 



Mrs. Joseph Shaw, 



Major-General C. E. Webber, C.B. 



were elected Members of the Royal Institution. 



The following Alterations in the Bye Laws of the Royal Institu- 

 tion were passed : — 



In Chapter I. (OftTie Government. And of the Enacting and Rejpealing 

 of Bye Laws). 

 In Art. 1, line 9, omit '^ and fifteen Visitors, so chosen." 

 In Art. 1, line 10, omit ^^ either" and "or Visitor." 

 In Art. 1, line 11, insert '^neither shall the major pao^t of the Visitors 

 have served the office of Visitor during any part of the preceding 

 year." 

 In Chapter II. (Of the Election, Bights, and Privileges of the Members). 

 Repeal Article 7. 

 In Art. 8, line 1, insert '■'■paid his admission fee of ten guineas, and 



who has." 

 In Art. 8, line 4, omit '^'^ if his annual payment he five guineas, or 

 the sum often guineas, if his annual payment he two guineas" 

 Vol. XIIL (No. 81.) h 



