CONTENTS. V 



PAGE 



XXVI. On a New Method for Determining the Mechanical Equiva- 

 lent of Heat. By A. G. Webster 490 



XXVII. A Standard of Light. By John Trowbridge .... 494 



Proceedings 501 



Memoirs: — 



Henry Lawrence Eustis 513 



Edvrard Jarvis 519 



Alpbeus Spring Packard 522 



Benjamin Silliman 523 



George Benthani 527 



Mark Pattison 539 



List of the Fellows and Foreign Honorary Members . . 541 

 Index 549 



