﻿CONTENTS OF PART II. 



FIOI 



V. On the Death of Plmy the Elder. By Jacob Bigelow, M. D 223 



VI. Register of the Thermometer for 36 Years, from 1821 to 1856, to which is added 

 the Quantity of Eain falling in Boston, Mass., for 34 Years, from 1823 to 1856. 

 By Jonathan P. Hall 229 



YII. A History of the Fishes of Massachusetts. By David Humphreys Stoker, M. D., 



A. A. S. Continued from Vol. V. p. 296. (With Plates.) . . . .309 



Vni. Netiusia, a New Genus of Rosacese. By Asa Gray, M. D 373 



IX. Diagnostic Characters of New Species of Phaenogamous Plants, collected in Japan 

 by Charles Wright, Botanist of the U. S. North Pacific Exploring Expedition. 

 (Published by Request of Captain John Rodgers, Commander of the Expedi- 

 tion.) With Observations upon the Relations of the Japanese Flora to tliat of 

 North America, and of other Parts of the Northern Temperate Zone. By Asa 

 Gray, M. D 377 



X. On the Genus Croomia, and its Place in the Natural System. By Asa Gray, M. D. 



(With a Plate.) ' 458 



XI. Characters of Ancistrophora, a New Genus of the Order Compositaj, recently de- 

 tected by Charles Wright, in the Eastern Part of Cuba. By Asa Gray, M. D. 457 



XII. On a New Species of Medusa, related to Stephauomia, Crystallomia polygonata. 



By James W. Dana. (With a Plate.) 459 



Xni. A New Method for Correcting a Planet's Orbit. By Truman Henry Safford, A. B. 461 



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Statutes and Standing Votes of the American Academy of Arts and Sciences , . . i 

 Fellows of the American Academy of Arts and Sciences ix 



