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XXII.-Sliding Friction on an Inclined Plane; A. S. KIMBALL, 181

XXIII.—On the constitutional formulæ of Urea, Uric Acid,

and their derivatives; by J. W. MALLET ---------... 185

XXIV.-On Flint-implements from the Stratified Drift of

the vicinity of Richmond, Va; by CHARLES M. WALLACE, 195

XXV.-Description of a new Trilobite, Dalmanites dentata;

by S. T. BARRETT,---------

........ 200

XXVI.--On the Samarskite of Mitchel County, North Caro-

lina ; by EDWARD S. DANA, -- --------------------

XXVII.- Effect of Silicic Acid upon the estimation of Phos-

phoric acid by Ammonium Molybdate; E. H. JENKINS, - 204

XXVIII. On the youngest Huronian Rocks south of Lake

Superior and the age of the Copper-bearing Series; by

T. B. BROOKS, ---- ......

--...- 206

XXIX.-On a new Method of measuring the Velocity of Elec-

tricity; by Joseph LOVERING ---...

211

APPENDIX.-XXX.-Principal Characters of the Tillodontia;

by 0. C. MARSH, .--.---... ------ .............. 249

SCIENTIFIC INTELLIGENCE.

Chemistry and Physics.—Problems in Chemical Dynamics, BERTHELOT, 214.---

Action of Light on Silver Bromide. Vogel., 215.-Corrosion of Platinum stills

by Sulphuric Acid, SCHEURER-KESTNER: Production of a Secondary Hexyl Alco-

hol, OECHSNER DE CONINCK, 216.-Rosolic Acid, GRAEBE and CARO, 217.--Syn.

thesis of Betaine, GRIESS: New Acid isomeric with Alizarin, SoHUNK and Roe-

MER : Constitution of Acids and Salts, BERTHELOT, 218.-Division of an Acid

among several Bases, BERTHELOT, 219.--New Pyrheliometer, CROVA, 220.- Ther-

mal Equivalent of Magnetism, CAZIN : Leyden Jar Regulator, MCLEOD, 22).-

Report to the Philosophical Society of Glasgow on the Production of Nitric acid

from the free Nitrogen of the Air, E. M. Dixon, 222.-On the Electrical Con-

ductivity of stretched Silver wires, J. G. MACGREGOR: The Nature of Light, by

E, LAMMEL, 224,- Manual of Introductory Chemical Practice, for the use of

Students, by G. C. CALDWELL: Electrical Conductivity of Saline Solutions, by J.

G. MACGREGOR, 225.

Geology and Mineralogy.-Supposed Agency of Ice-Floes in the Champlain Period,

by A. WINCHELL, 225.-Outlet of the Great Salt Lake, by G. K. GILBERT, 228.--

Second Report of Progress of the Mineralogical, Geological and Physical Survey

of the State of Georgia, by G. LITTLE, 229.–Geological Survey of Ulinois, A. H.

WORTHEN, Director, etc., vol. vi: U. S. Geological Survey of the Territories under

Dr. F. V. HAYDEN, 231.-Geological Sketches by L. Igassiz: Geological Survey

of Victoria, Report of Progress, R. B. SMYTH, 232.-Glacial phenomena along

the Kittatinny or Blue Mountain: Wisconsin Geological Survey: Frequency of

Earthquakes relatively to the age of the Moon, A. PERREY, 233.-Fossil Fishes

of the Devonian of Tula, H. TRAUTSCHOLD); Occurrence of native Zinc: Brookite:

Serpentines of Zöblitz Greifendorf and Waldheim. J. LEMBERG, 237,-Selwyn-

ite, Noumeïte, Garnierite, G. H. F. ULRICH : Errata to Manual of Geology of J.

D. Dana, 235.

Botany.-Notes on Agave, by Geo. ENGELMANN, 235.-Structure of the Leaves

of Grasses, J. DUVAL-JOUVE, 237.-Botryopteris Forensis: Silicified fossil Fruits

or Seeds: Respiration of Plants, MAYER and WOLKOFF, 238.--Classification of

Nostochineæ: Gymocladus in China : Flora Brasiliensis: Das Haustorium der

Loranthaceen und der Thallus der Rafflesiaceen und Balanophoreen, 239.--The

Movements and Habits of Climbing Plants, C. DARWIN, 240,

Astronomy.A series of Astronomical Drawings for the Centennial Exhibition :

Our Place among Infinities, R. A. PROCTOR, 241.

Miscellaneous Scientific Intelligence.- Mt. St. Elias: Harbors of Alaska and the Tides

and Currents in their vicinity, by W. H. Dall, 242.-Memoirs of the Peabody

NUMBER LXIV.

Page

ART. XXXI.-On the Gases contained in Meteorites; by

ARTHUR W. WRIGHT,------

----- 253

XXXII.—Review of Croll's Climate and Time with especial

reference to the Physical Theories of Climate maintained

therein; by SIMON NEWCOMB,-...

........ 263

XXXIII.-On crystals of Tourmaline with enveloped Ortbo-

clase; by EDWARD H. WILLIAMS, JR., - -----... 273

XXXIV.—The Conglomerate Series of West Virginia ; by

William M. FONTAINE, ---- ....

--..... 276

XXXV.-Results of Experiments on the Set of bars of

Wood, Iron, and Steel, after a Transverse Stress; by

Wm. A. NORTON,-..

........ 284

XXXVI.-On the constitutional formulæ of Urea, Uric Acid,

and their derivatives (concluded); by J. W. MALLETT, 291

XXXVII —Evidences of horizontal crushing in the formation

of the Coast Range of California; by JOSEPH LE CONTE, 297

XXXVIII.—Description of Mancasellus brachyurus, a new

fresh-water Isopod; by O. HARGER, ----...--------- 304

XXXIX.- Professor Tyndall on Germs, ---

305

XL.—Discovery of a new Planet; by C. H. F. PETERS, --... 317

APPENDIX.-XLI. - Principal Characters of the Brontothe-

ridæ ; by 0. C. MARSH, -------

---------- 335

SCIENTIFIC INTELLIGENCE.

Chemistry and Physics.-On a Crystallized Hydrate of Hydrochloric acid, PIERRE

and PUCHOT: On the decomposition of Water by Platinum, DEVILLE and DEBRAY,

318.- On a new compound of Sulphur and Oxygen, R. WEBER: On the Purifi-

cation of Carbon disulphide, FRIEDBERG, 319.-- The new Metal Gallium, Bois-

BAUDRAN: Conductivity of Gases, M. A. WINKELMANN, 320.— Thermal Properties

of Liquids, M. PICTET: Dependence of Electrical Resistance on the Motion of the

Conductor, M. EDLUND, 321.-Electric Spark with large Batteries, DE LA RUE and

MULLER, 322.—Acoustics, A. M. MAYER, 324.

Botany and Zoology.-Botanical Contributions, 325.- Botanical Necrology: Life

Histories of Animals, including Man, by A. S. PACKARD, JR., 326.-On some re-

markable forms of Animal Life from the great deeps off the Norwegian Coast,

etc., by GEORGE 0. SARS, 328.- A Course of Practical Instruction in Elementary
Biology, by HUXLEY and MARTIN: Crustacea of Mexico and Central America, by
M. A. MilNE-EDWARDS: Cumacea from great depths in the Arctic Ocean, by
G. O SARS, 329.- Moa or Dinornis of New Zealand : Carnivorous Reptiles

having some features of Carnivorous Mammals, from the Triassic (?) of South

Africa, Prof. Owen: The Crustacean, Artemia salina, changed in some of its

characters, etc., W. J. SCHMANKEWITSCH, 330.

Astronomy.- Astronomical and Meteorological Observations made during the year

1873, at the U. S. Observatory, Rear-Admiral B. F. SANDS, Superintendent:

Auxiliary Tables for determining the angle of position of the sun's axis, 331.

Viscellaneous Scientific Intelligence. - Third Report of the Settle Caves (Victoria
Cave) Committee of Exploration, by R. H. TIDDEMAN, 331.- Air and its Relations
to Life, by WALTER N. HARTLEY: Geological and Geographical Survey of the
Territories, F. V. HAYDEN in charge: Compressed Peat: Report of the Superin-
tendent of the U. S. Coast Survey, 332.- Obituary.-I. A. Lapham, 333.-Rev.

Augustus Wing, 334.

NUMBER LXV.

Page

ART. XLII.-On supposed changes in the Nebula M. 17=

h. 2008=G. C. 4403; by EDWARD S. HOLDEN,- ....... 341

XLIII.-. On the effect of thin plates of Iron used as armatures

for Electro-Magnets, and a new form of Induction Coil;

by John TROWBRIDGE, -----

-...... 361

XLIV.-Concerning Phosphorus Oxychloride; by Ira REM-

SEN, -------

--.-365

XLV.-On additional species of Fossils from the Primordial

of Troy and Lansingburgh, Rensselaer County, N. Y.;

by S. W. FORD,--.---...--...------...

........ 369

XLVI.-On a simple and very accurate method of tuning

two Forks to unison; by ROBERT SPICE, ------ ........ 372

XLVII.- Silica of grasses and other plants carried up as Di-

atoms or other siliceous grains, and not in solution or as

soluble silicates; by P. B. WILSON, ..... ........ 373

XLVIII.—The Conglomerate Series of West Virginia ; by

William M. FONTAINE -----

-...-374
XLIX.—On new twins of Staurolite and Pyrrhotite; by ED-

WARD S. DANA, --...--

-------- 384

L-Researches on the Solid Carbon Compounds in Meteor-

ites; by J. LAWRENCE SMITH, -------

------..-...... 388

LI.-On the Oxidation product of Glycogen with Bromine,

Silver Oxide and Water; by R. H. CHITTENDEN, ... -- 395

LII.—On the existence or not of Horns in the Dinocerata;

by RICHARD OWEN, ----

-----.... 401

APPENDIX.-LIII.-On some Characters of the genus Co-

ryphodon; by O. C. MARSH, ........................ 243

SCIENTIFIC INTELLIGENCE.

Chemistry and Physics.-Diplometer, LANDOLF: Specific Heat of Gases, WIEDE-

MANN, 403.-Crooke's Radiometer, STONEY, 404.—The Gram Magneto-electric

machine, TRESCA, 405.—Effect of increase of temperature on the Index of Re-

fraction, MENDENHALL, 406.

Geology and Mineralogy.--Does the actual vegetation of the Globe furnish any

general marks by which it could be recognized in all countries if it became fos-

sil? 407.-Report of the Geological Survey of Ohio, by J. S. NEWBERRY, 409,-

Geological Survey of Alabama, by EUG. A. SMITH, 410.--The Geological Record

for 1874, by Wu. WHITAKER, 411.-Report on the Geology of a portion of Colo-

rado examined in 1873, by J. J. STEVENSON: Das Gebirge um Hallstatt, von

MOJSISOVICS, 412.- Rammelsberg; Handbuch der Mineral-Chemie: Einleitung

in die Krystallberechnung, von CARL KLEIN, 413.

Botany and Zoology.-Phænological observations in Giessen, HOFFMAN: Bulletin of

the Bussey Institution, Harvard University, 414.-Nymphæa flava: Note on

some of the Starfishes of the New England Coast, by A. E. VERRILL, 416.—

Häckel's theory (Allæogenesis) of the genetic connection between the Geryon.
idæ and Æginidæ, by A. AGASSIZ, 420.-Animal Parasites and Messmates, VAN

BENEDEN : The Journal of Anatomy and Physiology, conducted by G. M. Hum.

PHREY. 421.-Bulletin No. 2, U. S. Geological Survey of the Territories, 422.

Astronomy. Observations of the planet Jupiter: Repertory of works in Pure and

Mixed Mathematics, KENIGSBERGER and ZEUNER, 422.

Miscellaneous Scientific Intelligence.—The American Cyclopædia, 422.-Annual

Report of the Light-House Board to the Secretary of the Treasury for the year

1875: Meter-Diagram, 423.- Obituary.-A. R. MARVINE, 424.

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NUMBER LXVI.

Page

Art. LIV.-Note on the Duplicity of the “ 1474” line in the

Solar Spectrum; by C. A. YOUNG, ------------------ 429

LV.-On a Lithia-bearing Biotite; by G. W. HAWES, ------ 431

LVI.—Researches on the Solid Carbon Compounds in Mete-

orites; by J. LAWRENCE Smith,------

.---. 433

LVII.—Results of Experiments on Contact Resistance; by

W. A. Norton, .......

LVIII.-Physical Observations on Saturn; by L. TROUVELOT, 447

LIX.-Curve of Eccentricity of the Earth's orbit; by R. W.

MCFARLAND, -----------

456

LX.—On a Bolide of January 31st, that passed over Ken-

tucky; by J. LAWRENCE SMITH,-.---. ............ 458

LXI.-Notes on the Sensitiveness of Silver Bromide to the

Green Rays as modified by the Presence of other Sub-

stances; by M. CAREY LEA, ---..

------ 459

LXII.-Chemical Composition of Durangite; by G. J. BRUSH, 464

LXIII. — The Geological Survey of Brazil; by C. F. HARTT, 466

LXIV.—Meteoric Stone of Waconda; by C. Ú. SHEPARD, Sr., 473

LXV.-Paleozoic Subdivisions on the 40th Parallel; by

CLARENCE KING, -----------------------...----... 475

LXVI.—A Nebula-photometer; by E. C. PICKERING, ------ 482

LXVII.-On a new Sub-order of Pterosauria; by 0. C. Marsh, 507

LXVIII.—Notice of new Odontornithes; by 0. C. Marsh, ---- 509

SCIENTIFIC INTELLIGENCE.

Chemistry and Physics.-Hydrocellulose, GIRARD, 483.—Decomposition of Stearic

Acid by distillation under Pressure, JOHNSTON: Liquid Carbon Dioxide in min-
eral cavities, HARTLEY: Decomposition of Alcohol by Aluminum and its Iodide,
GLADSTONE and TRIBE, 484.–New Method for producing Condensed Hydrocar-
bons, WATSON SMITH: Manganese Boride and on the Function of Manganese in
Iron Metallurgy, TROOST and HAUTEFEUILLE, 485.-Occurrence of Platinum, Pal-

ladium, and Selenium in Silver coins, RÖSSLER: Conversion of Olefines into the

corresponding Alcohols, BOUTLEROW, 486.-Trimethylbenzols of Coal tar Oil

and their Separation from each other, JACOBSEN: Detection of Phloroglucin and

Nitrites, WESELSKY: Succinic acid obtained from Active Tartaric acid, BREMER

and VAN'T HOFF, 487. - Re-conversion of Paroxybenzoic acid into Salicylic acid,

KUPFERBERG: New Hydro-oxy-benzoic Acid, EMMERLING and OPPENHEIM: Vicin,

RITTHAUSEN: Acoustic Attractions, DVORAK,488.-Correlation of Forces, GROVE,

489.-Change of Volume of Electric Conductors, ExNER: Proper Motion of the

Stars, SECCHI, 490.

Geology and Mineralogy.-Paleozoic fossils from the Serpentine formation of

Chaberton 491. - Eozoon Canadense: Exploration of Lake Titicaca, A. AGASSIZ

492.-Huronian South of Lake Superior, ROLAND IRVING: fossil bird from

the Eocene of New Mexico, COPE: Richmond Infusorial Stratum, 493.-Car-

boniferous Articulates: Note on the Uinta and Wahsatch Ranges, C. KING:

Ceraurus pleurexanthemus, of Trenton Falls. C. D. WALCOTT, 494.-Glacial

phenomena in Jefferson Co., New York: Origin of the Porphyry of Marble-

head, Mass., 495.--Hayden's Report for 1874, 496.--Age of Angiospermous

plants referred to the Cretaceous, 497.-Swiss Paleontological Society: Geo-

logical Survey of New Jersey, Cook: Eocene Corals of Italy, 498.--Crystallo.

graphy, of P. GROTH, 499.

Zoology.---Recent Corals from Tilibiche, Peru. A. AGASSIZ, 499.--Caspian Sea, 500.

Astronomy.--Transit of Venus observed in Bengal: new Planets, 501.

Miscellaneous Scientific Intelligence.-Atti della Reale Accademia dei Lincei, 502.--

Statistics of Mines and Mining R. W. RAYMOND, 504.--National Academy of

Sciences: Memoir of Caroline Herschel, 505.--Depth of the Pacific, 506.

INDEX, 513.

THE

A MERICAN

JOURNAL OF SCIENCE AND ARTS.

[THIRD SERIES.)

ART. I.- Contributions to Meteorology, being Results derived from

an examination of the United States Weather Maps and from other sources ; by ELIAS LOOMIS, Professor of Natural Philosophy in Yale College. Fourth paper. With Plate. [Read before the National Academy of Sciences, Philadelphia, Nov. 2, 1876.]

Movement of Areas of high barometer. HAVING determined the average direction and velocity of movement of areas of low barometer within the limits of the United States, I desired to make a similar determination respecting areas of high barometer. As I have in my possession only one Weather Map for each day, I have frequently found it difficult to follow the course of areas of high barometer from day to day, and have therefore confined my comparison to the monthly charts published by the U. S. chief signal officer. Among these I found three charts which gave the tracks of areas of high barometer for a month each, viz: Aug., 1873, Dec., 1874, and Jan., 1875. The following are the average courses and velocities of the areas of high barometer for these months :

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