CONTENTS. Vii 
XLI. The Numerical Relation between the Atomic Weights, 
with some Thoughts on the Classification of the Chemical 
Elements; by Prof. Jostan P. Cooxs, Jz., A.M., — - - 387 
CorresPonbDENCcE.—Extract from a letter from Dr. W. I. Bur- 
NETT to Prof. J. D. Dana, 407.—Correspondence of M. Jz- 
ROME Nicxiis—Award of Prizes by the Academy of Sci- 
ences, 412.—Deaths and Academic Elections: Zoological 
Society for the Acclimation of Animals: Artificial Produc- 
tion of Pleochroism in Crystallized Substances, 414.—De- 
rivatives of nitrotartaric acid: On the gluten of wheat, 415. 
—Natural History of Lupulin, 416.—Various Communica- 
tions: Industrial Photometry, 417.—On forming vessels of 
gold by the aid of phosphorus: Gilding of Silk, &c.: Local 
anesthesis, 418.—Influence of bismuth on the ductility of 
Copper: On the bronze employed in sheathing ships, 419.— 
Traité des Poisons, ou Toxicologie appliquée a la Medicine 
legale, etc., par le Docteur Cu. Fuanpin: Traité de l’Elec- 
tricité théorique et appliquée, par Auc. pe ra Rive: Mé- 
canique Analytique par Lacranee: Lecons sur la Theorie 
mathematique de l’élasticité des corps solides, par Lamz: 
La régle a calcul expliquée, etc., par Benarr, 420. 
SCIENTIFIC. INTELLIGENCE. 
Chemistry and Physics.—Artificial production of polychroism in crystallized mem 
421.—Rate of transmission of impressions made upon the nerves, 422.—Pre n of 
large crystals of sulphate of jodo- -quinine for optical purposes: On the law of mean 
in magnetic and paramagnetic substances, 423.—On the laws of the attraction of elec- 
tro-magnets, 424.—Identity of Niobium and Pelopium, 425.—Preparation and Properties 
of metallic Aluminum : Preparation of Aluminum og electric deposition, 427,—On the 
arsen-ethyls: On the alcohol of benzoic acid, 428.—Formation of nitruret of benzoyl 
m hippuric acid : On the exhibition of the fixed lines of the solar spectrum with ordi- 
dary flint glass prisms, by Oapen N. Roop, 4 
Mineralogy an d Geology.—Appendix to Observations on the Homcomorphism of some 
Mineral ee, by James D. Dana, 430.—On Descloizite, a new Mineral Species, by 
M. A. Damour, 434.—Ancient Lake in the Colorado Desert, 435.—Quicksilver Mine of 
aaa California, by W. P. Buaxr, 438,—Conistonite, 440. 
Botany an Zoology.—On the Age of the pee Tree recently felled in California, by A. 
Gray, ve a de Gow Plantarum Glumacearum, auctore E. G. SreupEen: Lindley’s Fo- 
lia Orchidacea : Epistole Caroli a Linné ad Bernardum de Jussieu Inedite, et mutuse 
Bernardi ‘a Lien: 443.—Localities and Habits of certain species of Insects, &c., 
by J.P. Kirtrann, 444, baie 
Astronomy.—Comet V, 1853, 444,—Obituary, Prof. A. C. Petersen, 445, je a : 
