In future, Forms of Acknowledgment of the 1 Proceedings ' 

 will be issued only with the concluding No. of each volume. 



NOTICE TO AUTHORS. 



Authors of Papers intended for the 1 Proceedings ' or i Philo- 

 sophical Transactions' are urgently requested to send in all 

 drawings, diagrams, or other illustrations in a state suitable 

 for direct photographic reproduction. 



NOTICES TO FELLOWS OF THE ROYAL SOCIETY. 



The Offices and Library of the Society will be closed at Whitsuntide 

 from Saturday, May 25, to Tuesday, May 28, both days included. 



The * Proceedings ' are sent by post to every Fellow of the Society who resides 

 within the limits of the Postal Union. The ' Philosophical Transactions ' and the 

 ' List of Fellows ' are delivered only to those Fellows who call for them, or who 

 send a written application to the Assistant Secretary. Such an application may, if 

 so desired, be filed as a standing order. 



The separate Papers forming the 'Philosophical Transactions' will be sent post 

 free, as issued, to those Fellows who prefer to have them in that form. And, on 

 application to Messrs. Harrison and Sons, 46, St. Martin's Lane, these will be bound 

 in a cloth case for 2s. 6d., or the cloth cases for binding may be purchased, 

 price Is. 6d. 



A printed post-card of the papers to be read at each meeting will be sent weekly 

 to any Fellow upon application to Messrs. Harrison and Sons, 46, St. Martin's 

 Lane, W.C. 



Sold by Messrs. Harrison and Sons. 

 Koyal 4to. Price Is. 



LIST OF FELLOWS OF THE EOYAL SOCIETY. 



