THE ROYAL SOCIETY. 



VOL. XLIV. No. 272. 



CONTENTS. 



PAGE 



A new Method of determining the Xuinber of Micro-organisms in Air. By 

 Thomas Cards' el ley, D.Se., Professor of Chemistry, and Thos. Wilson, 

 University College, Dundee ......... 455 



Obituary Xotice : — 



Philip He set Gosse xxvii 



Index xxix 



Title and Contents. 



Price One Shilling and Sixpence. 



