20 Books Received. 



Washington. — Bulletin of the Philosophical Society of Washing- 

 ton. Vol. 14, pp. 179—204, 1902. 



The Society. 

 York. — Annual Report of the Yorkshire Philosophical Society 



for 1902. The Society. 



Zurich. — Vierteljahrsschrift der Natursforschenden Gesellschaft 

 in Zurich. Parts 1 and 2, 1902. 



The Society. 



