274 Meteorological Statistics. — Selected Candidates. [May 1, 



10° north latitude and the equator, and between 20° and 30° west longi- 

 tude, in the month of January. The uniformity of their sequence is very 

 striking ; and it would no doubt have been still more so if the data had 

 previously been discussed in the above-mentioned manner. The short 

 line with an arrow-head shows the direction and amount of current ; 

 but the centre of each square is the point of departure, for which the 

 contour shows the joint effects of winds and current. 



To recapitulate. I have shown in this memoir : — 1, what isochrones 

 are, and their great importance ; 2, how to calculate them ; 3, how to 

 construct a machine to supersede their calculation and to make it 

 possible to have them drawn for special cases at a trifling cost ; 4, how 

 to make an isochronal chart ; and, 5, how to use it on individual occasions. 



I should be glad if one result of this memoir were to bring into greater 

 prominence than at present the high value of the ocean statistics collected 

 and now being published by the Meteorological Office, and the fact that no 

 degree of precision of meteorological knowledge need be thrown away in 

 the practice of navigation. Such knowledge will be good for all time, and 

 will always afford the requisite data whence isochrones conformable to 

 the varying performances of new varieties of ships and to new lines of 

 commerce may be calculated. 



May 1, 1873. 



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 : — 



William Aitken, M.D. 



Sir Alexander Armstrong, M.D., 



K.C.B. 

 Eobert Stawell Ball, LL.D. 

 John Beddoe, M.D. 

 Frederick Joseph Bramwell, C.E. 

 Edward Killwick Calver, Capt. 



E.N. 



Eobert Lewis JohnEllery,F.E.A.S. 



James Augustus Grant, Lieut.-Col., 

 C.3. 



Clements Eobert Markham, C.B. 

 George Edward Paget, M.D., D.C.L. 

 George West Eoyston-Pigott, M.D. 

 Osbert Salvin, M.A. 

 The Hon. John William Strutt, M.A. 

 Henry Woodward, E.G.S. 

 James Young, E.C.S. 



Dr. Arthur Gamgee was admitted into the Society. 



The following communications were read : — 



