THE

AMERICAN

JOURNAL OF SCIENCE.

EDITOR: EDWARD S. DANA.

ASSOCIATE EDITORS

PROFESSORS GEORGE L. GOODALE, JOHN TROWBRIDGE,
AND WM. M. DAVIS, OF CAMBRIDGE,

PROFESSORS A. E. VERRILL, HORACE L. WELLS, CHARLES
SCHUCHERT, H. E. GREGORY, AND HORACE S.
UHLER, OF NEW HAVEN,

PROFESSOR JOSEPH S. AMES, OF BALTIMORE,
MR. J. S. DILLER, OF WASHINGTON.

FOURTH SERIES

VOL. L-[WHOLE NUMBER, CC].

NEW HAVEN, CONNECTICUT.

1920.

THE TUTTLE, MOREHOUSE & TAYLOR COMPANY

NEW HAVEN

Number 295.

ART. I.-The Relative Activity of Radium and the Uranium

with which it is in Radioactive Equilibrium; by J. H. L.

JOHNSTONE and B. B. BOLTWOOD...

Page

1

ART. II. The Devonian of Central Missouri (III). The

Cooper Limestone; by D. K. GREGER.

20

ART. III. The Athabaska Series; by F. J. ALCOCK

25

ART. IV.-Italite, a new Leucite Rock; by H. S. WASHING-

TON

33

ART. V.―The Late Lower Cretaceous at Federal Hill, Mary-

land; by E. W. BERRY....

48

ART. VI.—Triassic and Jurassic Formations in southeastern

Idaho and neighboring regions; by G. R. MANSFIELD .. 53

ART. VII.--The Anderson Esker; by J. R. REEVES

ART. VIII.—A New Agelacrinitid from the Chazy of New

York; by T. H. CLARK...

65

69

SCIENTIFIC INTELLIGENCE.

Chemistry and Physics-Oxidation of Paraffine by Means of Oxygen Gas, C.

KELBER: New Determination of the Absolute of the Radium-Uranium

Ratio, S. C. LIND and L. D. ROBERTS, 72.-Treatise on General and Indus-

trial Inorganic Chemistry, E. MOLINARI: Laboratory Manual of Elemen-

tary Colloid Chemistry, E. HATSCHEK, 73.

Geology and Natural History-The Brachiopoda of the Namyau Beds, Northern

Shan States, Burma, S. S. BUCKMAN, 74.-Systematische Petrographie auf

genetischer Grundlage, W. HOMMEL, 75.-Geological Survey of Western

Australia, A. GIBB MAITLAND: New Zealand Geological Survey, P. G.

MORGAN: Principles of Animal Biology, A. FRANKLIN SHULL, etc., 76. —

Cytology, with Special Reference to the Metazoan Nucleus, W. E. A.

AGAR, 77.-General Botany for Universities and Colleges, H. D. DENS-

MORE: Problems in Botany, W. L. EIKENBERRY: Joseph Dalton Hooker

(Pioneers of Progress, Men of Science), F. O. BOWER, 78.

Miscellaneous Scientific Intelligence-The National Research Council: Inter-

national Congress of Mathematicians, 79.-Pasteur, the History of a Mind,

EMILE DUCLAUX: The Relation Between Religion and Science, A. S.

WOODBURNE: Explorations and Field Work of the Smithsonian Institu-

tion in 1919, 80.-Annual Report of the Board of Scientific Advice for

India for 1918-19: The Technical Review: Report of the Commission

appointed by the University of Pennsylvania to investigate modern

Spiritualism, 81.

Obituary―T. W. BACKHOUSE: A. P. DECANDOLLE, 82.