310 



List of Candidates. 



[May 7, 



or reflected at the surfaces of any number of media bounded by cylin- 

 drical surfaces in the most general sense (including, of course, plane as a 

 particular case), the generating lines of which are parallel, and for 

 brevity's sake will be supposed vertical, and if a be the altitude of the 

 ray in air, a', a", . . . . , its altitudes in the media of which the refractive 

 indices are p.', p" ,...., then 



(1) The successive altitudes will be determined by the equations 



sin a=;u', sin a'=ju", sin a"= . . . . , 



just as if the ray passed through a set of parallel plates. 



(2) The course of the horizontal projection of the ray will be the same 

 as would be that of an actual ray passing through a set of media of 



refractive indices ** cos a , ^ cos a , .... instead of u' u". . As 



cos a cos a 



a' < a, the fictitious index is greater than the actual, and therefore the 

 deviation of the projection is increased by obliquity. 



These two propositions, belonging to common optics, place the justice 

 of Mr. Grubb's conclusions in a clear light. April 30, GL Q-. STOKES.] 



May 7, 1874. 



WILLIAM SPOTTISWOODE, M.A., Treasurer and Vice- 

 President, in the Chair. 



In pursuance of the Statutes, the names of the Candidates recom- 

 mended for election into the Society were read from the Chair as 

 follows : 



Isaac Lowthian Bell, F.C.S. 

 W. T. Blanford, E.G-.S. 

 Henry Bowman Brady, F.L.S. 

 Thomas Lauder Brunton, M.D., 



Sc.D. 



Prof, W. Kingdon Clifford, M.A. 

 Augustus Wollaston Franks, M.A. 

 Prof. Olaus Henrici, Ph.D. 

 Prescott G-. Hewett, F.E.C.S. 



John Eliot Howard, F.L.S. 

 Sir Henry Sumner Maine, LL.D. 

 Edmund James Mills, D.Sc. 

 Eev. Stephen Joseph Perry, 



F.E.A.S. 



Henry "Wyldbore Eumsey, M.D. 

 Alfred E. C. Selwyn, F.GKS. 

 Charles William Wilson, Major 



E.E. 



The Presents received were laid on the table, and thanks ordered for 

 them. 



The following Papers were read : 



