CONTENTS. vii 
XXXIX. Reéxamination of American Minerals: Part [V—Bol- 
‘tonite; Iodid of Silver; Copiapite; Owenite; Xenotime ; 
Lanthanite; Mangano-magnesian Alum; Apophyllite ; Schrei- 
bersite ; Protosulphuret of Iron; Cuban; PY J. LAwRENCE 
Situ, M.D., - - - 372 
XL. Correspondence of M. Jerome ask tem ketdseg of Sci- 
ences, 381.—On the Phenomenon called “ Spirit-rappings :” ” 
Electricity-—Electro-chemical action, 382.~-Pyro-electric 
currents: On the electricity produced during the evapora- 
tion of salt-water, 384.—_Economical illumination by Electric 
light: Decomposition of Kyanite by galvanic heat, 385.-- 
Electro-magnetic Machine: Magnetism by Rotation, 386.— 
Experiments with reference to firing mines by electricity: 
Various Memoirs, 387.—Dilatation and Contraction of Me- 
tallic Platess New Greek Fire, 388.—Coupled Cannons, 
389,—Photography—Heliographic engraving: Collodion : 
Société d’Encouragement pour I’Industrie Nationale, 390. 
Economical Lamp for obtaining high temperatures, 391.— 
XLI. Observations on the Nomenclature of the metals contained 
in Columbite and Tantalite ; by Prof. A. oe ln . - 
XLII. Murchison’s Siluria, —- = . ee 
| aes the Chemical Composition of ‘Clintonite by sil J. 
- 407 
Stay eas to asics: ; by Dr. F. * ‘ee - 410 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics —On the so-called Benzotoxyd and some other conjugate com- 
pounds; Researches on different questions in Organic Chemistpy—Composition of tan- 
nie acid, 412.-Decomposition of brucine by nitric acid : _Hydrocyanaldin : Production 
of propionic acid in fermentation: On some combinations of hydrargyro-methyl and 
—On a new Test for Zirconia, by G. J. Brusu: On the Electricity 7. the sue 
M. L. Paumrert, 415—A Vacuum made by Chemical means, by M. C. 
— 416. 
contributions to Mineralogy, by Jamzs D. Dana, 417.—Bei- 
trige zur Kenntniss dine Eisenhohofen-Schlacken, nebst einem geologischen Anhange, 
(on Iron Furnace Slags, etc. “ip by J. F. L. Hausmann, 421.—Temperature of the inte- 
rior of the Earth: A System of Mineralogy, comprising the most Recent Discoveries, 
by James D. Dawa, 424. a pe I SE 
Botany and Zoology.—Vietoria Ragin: othe Greet Water Lily of America; by Jon 
Fisk ALuen : Plante Junghuhnian umeratio Plantarum quas in Insulis sano et 
Sumatra detexit Fr. Junghuhn : site's Synopsis Plantarum Glumacearum, 4 
