THE 



PEOGEEDINGS 



OF 



ROYAL SOCIETY. 



May 4, 1876. 



Capt. F. J. O. EVANS, E.N., C.B., Vice-President, in the 



Chair. 



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

 them. 



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

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

 follows : — 



Capt. "WiUiam de Wiveleshe Abney, 

 E.E. 



Prof. Henry Edward Armstrong, 

 Ph.D. 



Eev. William B. Clarke, M.A., 



E.a.s. 



James CroU, P.E.S.E. 

 Edwin Dunkin, Sec. E.A.S. 

 Prof. John Eric Erichsen, E.E.C.S. 

 David Eerrier, M.A., M.D. 



Col. Augustus H. Lane Fox. 

 Prof. Alfred Henry Grarrod, M.A. 

 Eobert Baldwin Hayward, M.A. 

 Charles Meldrum, M.A., F.E.A.S. 

 Edward James Eeed, C.B. 

 Prof. William Eutherford, M.D. 

 Eobert Swinhoe, F.E.G.S. 

 Prof. Thomas Edward Thorpe, 

 Ph.D. 



The following Papers were read : — 



I. Supplementary Note on the Theory of Ventilation (see 

 Paper read on the 28th of January, 1875). By Francis 

 S. B. FRANgois DE Chaumont, M.D., Surgeon-Major, Army 

 Medical Department, and Conjoint Professor of Hygiene, 

 Army Medical School. Communicated by Prof. Stokes, Sec. 

 E.S. Eeceived March 8, 1876. 



In my previous paper I endeavoured to establish a basis for calculating 

 the amount of fresh air necessary to keep an air-space sufficiently pure 

 vol. xxy. b 



