Forces acting on Solid in contact with Liquid Surface. 149* 



As we have already remarked, the six different kinds of lines 

 can be considered as forming three groups with respectively 

 3 or 3*5 as factors in their C-values, these factors being 

 multiplied respectively by 1, 3, and 4 in the three groups.. 

 The analogy would suggest the existence of a fourth pair of 

 series (2 a) and (2 b) with 2.3 = 6 and 2. 3'5 = 7 as values of 0. 

 But of course the material of observation is not yet sufficiently 

 great or exact to allow any conclusions of this kind. 



There can hardly be any doubt that the very interesting 



form of the a- value for La, a = \/ ■*_ gi yen by Mr. Moseley,, 

 is the true one, as it coincides exactly with the mean of a T . 

 But his value a /q£ =0*3727 for a 3 seems too great, if we 



wish to retain the integer value 9 for C in La. 



In the complete coincidence of the order of Mr. Moseley's 

 numbers and of my ordinals of the elements, I see a very 

 strong support of my system, according to which there 

 should be respectively 4, 16, 36, and 64 elements in the 

 four first groups. But then also we shall get my ordinals 

 instead of the numbers used by Mr. Moseley"*, and for AI 

 the number 15, for Au 81, and my a-constants 3 and 9, 

 instead of 1 and 7*4 by Moseley. 



The apparent regularity of the C-values in the different 

 series seems also to speak for the opinion that my ordinals 

 are the true ones. 



Lund, May 11, 1914. 



XIX. On the Forces acting on a Solid Sphere in contact ivith 

 a Liquid Surface (II.). By Allan Ferguson, B.Sc. 

 (Lond.), Assistant- Lecturer in Physics in the University 

 College of North Wales, Bangor^. 



IT has been shown by the writer in a recent paper \ that 

 the surface-tension of a liquid may be determined from 

 a knowledge of the downward pull exerted on a sphere of 

 large radius so placed that its vertex is just on the general 

 level of the free liquid surface. The present note completes 

 the theoretical discussion there presented, by considering the 



* The same remark is also to be made in regard to the numbers given 

 by Sir E. Rutherford in Phil. Mag. xxvii. p. 868 (1914), for instance 

 Pb = 84, U = 94. 



t Communicated by Prof. E. Taylor Jones. 



\ Phil. Mag. xxvi. p. 925 (1913). 



