THE

AMERICAN JOURNAL

OF

SCIENCE AND ARTS.

CONDUCTED BY

PROFESSORS B. SILLIMAN AND B. SILLIMAN, JR.,

AND

JAMES D. DANA.

SECOND SERIES.

VOL. III.-MAY, 1847.

NEW HAVEN:

PRINTED FOR THE EDITORS BY B. L. HAMLEN,

Printer to Yale College.

Sold by H. DAY, New Haven.-LITTLE & BROWN, and W. H. S. JORDAN, Boston.-C. S.
FRANCIS & Co. and WILEY & PUTNAM, New York.-CAREY & HART, Philadelphia.-
N. HICKMAN, Baltimore, Md.-WILEY & PUTNAM, London.-HECTOR Bossange & Co.,
Paris.-NESTLER & MELLE, Hamburgh.

CONTENTS OF VOLUME III.

NUMBER VII.

ART. I. On Zoophytes, No. III; by JAMES D. DANA,

II. On the Induction of Atmospheric Electricity on the Wires of

the Electrical Telegraph; by Prof. JOSEPH HENRY,

III. A New Mineral from the Azores; by J. E. TESCHEMACHER,

IV. On the Delta and Alluvial Deposits of the Mississippi, and

other points in the Geology of North America, observed in

the years 1845, 1846; by C. LYEll,

V. Hybridity in Animals, considered in reference to the question.

of the Unity of the Human Species; by SAMUEL GEORGE

MORTON, M.D.

39

50

52

57

VI. Solution of a Mathematical Problem; by O. ROOT,

VII. On the North American Species of Isoëtes and Marsilea; by

Prof. A. BRAUN.-Communicated by Dr. G. ENGELMANN,

VIII. Review of the New York Geological Reports,

IX. Notice of New Fossil Footprints; by JAMES DEANE,

X. Notes on the Algae of the United States; by J. W. BAILEY,

Professor of Chemistry, &c., at the U. S. Military Academy, 80

XI. On the Fossil Vegetation of America; by J. E. TESCHEMA

CHER,

XII. On the existence of certain Lacustrine Deposits, in the vicin-

ity of the Great Lakes, usually confounded with the "Drift ;"

by I. A. LAPHAM,

XIII. On the Origin of Continents; by JAMES D. DANA,

XIV. Description of two New Species of Shells; by WILLIAM

CASE, Cleveland, Ohio,

74

86

90

94

- 101

Physics and Chemistry.-Gun-Cotton, 102.-On the Compounds of Phosphorus
and Nitrogen, by C. GERHARDT, 105.-Experimental Researches on the Nutri-
tive Power of green and dry Fodder, by M. BOUSSINGAULT: On the progressive
development of Vegetable Matter in Wheat, by M. BOUSSINGAULT: Memoir on
Coffee, by M. PAYEN, 106-Researches on Blood, by M. DUMAS, 108.-New
Saccharimetric Process, by M. EUG. PELIGOT, 109.-Rapid Method of estimating
Copper, by means of a Colorimeter, by M. JACQUELAIN: On the Molecular
Phenomena of the Voltaic Arc, by M. DE LA RIVE, 110.-On Electro-Physiol.
gy, by Prof. MATTEUCCI, 111.-Notices of the Progress of Experiments on the

Influence of Light on the Growth of Plants, by R. HUNT: On the Results of

an extensive series of Magnetic Investigation, including most of the known va-

rieties of Steel, by W. PETRIE, 112.-On the Mode of Developing the Magnetic

Condition, by Dr. SCORESBY, 114.-On some Results of the Magnetic Observa-

tions made at General Sir T. M. Brisbane's Observatory, Makerstoun, by J. A.

BROUS, 115.-New Metal, Ilmenium, 116.

Mineralogy and Geology.-Crystallized Carbonate of Lead, at Rossie, New York,
by G. HADLEY: On Coracite, a new ore of Uranium, by JOHN L. LECONTE,