PKOCEEDINGS OF 

 THE ROYAL SOCIETY. 



VOL, xlii. No. 257. 



CONTENTS. 



PAGE 



The Air of Sewers. By Professor Thomas Caenelley, D.Sc, and J. S. 



Haldane, M.A., M.B., University College, Dundee 501 



Index . . . . . 523 



Title and Contents. 



Price One Shilling and Sixpence. 



