IV CONTENTS. 



PAGE 



XIII. On the Limits of Accuracy in Measurements with the Tele- 



scope and the Microscope. By Pkofessor William 



A. Rogers 168 



XIV. Preliminary Report on the Echini of the Exploring Ex- 



pedition of H. M. S. " Challenger," Sir C. Wyville 

 Thomson, Chief of Civilian Staff. By Alexander 

 Agassiz 190 



XV. Contributions to American Botany. By Sereno Watson. 



1. Revision of the North American Liliaceaz 213 



2. Descriptions of some New Species of North American 



Plants 288 



XVI. A Neiv Receiving Telephone. By Professor A. E. Dol- 



bear 304 



XVII. Researches on the Substituted Benzyl Compounds. Fifth 



Paper. By C. Loring Jackson and J. Fleming White 306 



Proceedings 321 



Memoirs: — 



Jacob Bigelow ( 332 



Hon. Caleb Cushing, LL.D. .....' 342 



Silas Durkee, M.D 343 



John Barnard Swett Jackson . . ' . • .' 344 



John Clarke Lee 352 



John Mudge Merrick, S.B 353 



Benjamin Franklin Thomas 354 



William Cullen Bryant 355 



Joseph Henry 356 



Stephen Thayer Olney 367 



George B. Wood 368 



Friedrich Wilhelm Ritschl 369 



Karl Freiherr Von Rokitanski 370 



List of the Fellows and Foreign Honorary Members . . 373 



Index ■ 381 



