CONTENTS OF PAET II. 



PAGE 



X. Caroli a Linne ad Bernardum de Jussieu ineditfE, et mutuse Bernard! ad Linnae- 



ura Epistolae ; curante Adriano de Jussieu 179 



XL The Numerical Relation between the Atomic Weights, with some Thoughts on 



the Classification of the Chemical Elements. By Josiah P. Cooke, Jr., A.M. 235 



XII. A History of the Fishes of Massachusetts. By David Humphreys Storer, M. D., 



A. A. S. (With Seven Plates.) {Continued.) 257 



XIII. Plant^e NovjE Thurberian^ : The Characters of some New Genera and Species 



of Plants in a Collection made by George Thurber, Esq., of the late Mexican 

 Boundary Commission, chiefly in New Mexico and Sonora. By Asa 

 Gray, M. D 297 



XIV. On the Affinities of the Genus VAV^A, Benth. ; also of RHYTIDANDRA, 



Gray. By Asa Gray, M. D 329 



XV. On Two New Crystalline Compounds of Zinc and Antimony, and on the Cause 

 of the Variation of Composition observed in their Crystals. By Josiah P. 

 Cooke, Jr., A. M. (With a Plate.) 337 



XVI. Discussion of Observations for the Isodynamic, Isogonic, and Isoclinal Curves of 

 Terrestrial Magnetism on and near the Line of the Boundary Survey between 

 the United States and Mexico, made in 1849, 1850, 1851, and 1852, under the 

 Orders of W. H. Emory, and combined with Observations at San Francisco 

 (California), and Dollar Point (East Base), and Jupiter (Texas), furnished by 

 A. D. Bache. (With a Map.) 372 



XVII. Descriptions of New Species of Fossils, from the Cretaceous Formations of Ne- 

 braska, with Observations upon Baculites ovatus and B. compressus, and 

 the Progressive Development of the Septa in Baculites, Ammonites, and 

 Scaphites. By James Hall and F. B. Meek. (With Eight Plates.) . . 379 



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



Fellows of the American Academy of Arts and Sciences ix 



