CONTENTS. 
Page. 
Vaitiant); by M. U.-J. LeVernier, - . - 222 
XXX. Upon some Improvements, proposed by Sir David Brewster, 
in the Photographic Camera; by Epwin Emerson, - - 227 
XXXI. On the Age of the Red Sandstone formation of Vermont ; 
by E. Bintines, = - - - 2382 
XXXII. Agricultural Chemistry —-Soil- suolyeid: Notice of the 
Agricultural Chemistry of the Geological Surveys of Ken- 
tucky and Arkansas; by Prof. 8. W. Jonnson, - 233 
XXXII. The Great Comet of 1861.—1. Observations at Ric 
Haven, 252.—2. Observations at Washington, 254.—3. The 
Comet, as seen at the Observatory of Harvard College, Cam- 
bridge, Mass.; by G. P. Bonn, Director, 255.—4. Continua- 
tion of Account of Comet II; by G. P. Bonn, 261.—5. Addi- 
tional Observations at the U. 8. Naval Observatory, Wash- 
ington; communicated by Lt. J. M. Gitxiss, 265.—6. Ele- 
ments of the Comet, obtained at Harverford Observatory ; 
by Mr. M. C. Stevens, 266. 
SCIENTIFIC INTELLIGENCE. 
ical Chemistry—On the Coloring Matters derived from Coal Tar; by Mr. 
Perkin, F.C.S.: Aniline, 267.—Aniline Purple, generally known as Tyrian Par 
Mauve, Phenamine, Indisine, &c., 263 — Violine: Roseine, 270.—Fuchsine or Magenta : 
Preparation of Fuchsine by the Action of Bichlorid of Tin on Aniline, 271.—Prepara. 
IG, 
means of restoring old and faded engravings, etc., v. Gonup-BESANEZ, 275.—New 
Anwsthetic, 276. 
ca ie Chemistry—Reinsch’s test for Arsenic not applicable to solutions containing 
Arsenic acid, Wer THE 
.—Reply to Mr. Marcou’s strictures on Mr. F. B. Meek in his Notes on the Cre- 
taceous and Geiibaattoises Rocks of Texas, 278—Note on Mr. Leeqnereux’ s Table of 
paper of Messrs. Meek and Worthen on the Age of the Goniatite Limestone, 283. 
Botany.—Martius, Flora Brasiliensis: Flore Columbie terrarumque adjacentium Speci- 
Selecta, edidit H. Karsten: Journal of the Proceedings of the Linnean Society, 
289.—CalJuna vulgaris and Aira caryophyllea in the United States, 290 
Astronomy and Meteorology.—The recently discovered Asteroids, 291.—Note Explanatory 
of Baily’s Beads, by Epmunp Biunt, 292.—Meteoric Obeervatons April 20 asia Aug 
10, 1861: 1. New Haven, Conn.: 2. Per etone + —3. Natick, Mass., 295.— 
Remarkable Rain-Fall in Ohio, by S. B. McMinxan: Sets ‘following the discharge of 
Ordnance, 296. 
