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CONTENTS. Vii 
NUMBER XLV. 
Art. XXXII. On the Electrotyping Operations of the U. S. Coast 
Survey; by Georce Marutor, Electrotypist: being a Re- 
port to Major I. I. Stevens, Assistant in charge of the Coast 
Survey Office. With a Plate, - 305 
XXXII. Brief Characters of some New oe os Dane of 
Nyctaginacez, principally collected in Texas and New 
Mexico, by Cuartes Wricut, Esq., under the direction of 
Col. J. D. Granam; by Asa Gray, M.D., - - 319 
XXXIV. On the Discovery of two species of T ENCE aan in the 
State of Alabama, one of which is new; by Asa Gray, M.D., 324 
XXXV. On a method of exhibiting the Phenomena of Diffraction 
with the Compound Microscope ; by Ocpen N. Roop, A.B., 327 
XXXVI. On Minerals ar ha Chromic Iron ; Ls THOMAS 
H. Garrett, - 
XXXVII. On the Causes which may hive sicdvenl Chatigan in the 
Earth’s Superficial Temperature; by W. Hopxins, Esq.,etc., 334 
XXXVIII. Observations on a spe discovered Animalcule ; by 
J. W. Baitey, - - 3d4l 
XXXIX. A Consideration of some of the Phasocnone ae a of 
Sound, and their application in the Construction of Buildings 
designed especially for Musical Effect; by J.B. Upnam, M.D., 348 
XL. Notice of the Meteoric Iron found near Seneca River, 
Cayuga County, N. Y.; by Caartes Urpnam Sueparp, M.D., 363 
XLI. Notice of the “* Mastodon Giganteus” of Dr. J. C. Warren, 367 
me Notice of the Rarer Minerals and New Localities in West- 
rn North Carolina; by C. L. Hunter, M.D., 
XLII Review of Mr. Blake’s Article on the. few of Blastic 
Fluids; by Jorn E. Henpricks, - 378 
XLIV. Ona New System of Electro- Magnets ; aby M. J. Micesis, 380 
XLV. Abstract of Meteorological Observations made at Burling- 
ton, Vt., in 1852; by Z. Tuompson, - 385 
XLVI. Some ‘Aboount of the Proteus anguinus ; ty Face c. 
Datton, Jr., M.D. With a Plate, - - 387 
XLVII. On Eriesson’s Hot Air, or Caloric Bgine ; iy Prof. 
Wittiam A. Norton, - é “ 
SCIENTIFIC INTELLIGENCE. 
Correspondence.—Correspondence of M. J. Nicklés: On the Verification of a Standard 
Meter, 413.—On comparing Standard Weights in a Vacuum, 417.—Calorie Engine, 418. 
—Engine, using on bys oc water at a high temperature, 419.—Engine of 1 . Beaure- 
gard, 420.—Engine of M. Andrand, called Electro- sh 422,—Fusion and volatilize 
tion of Platinum sn Silica, 24, —Pisciculture : Prize. ‘ 
