THE

AMERICAN

JOURNAL OF SCIENCE.

EDITOR: EDWARD S. DANA.

ASSOCIATE EDITORS

PROFESSORS GEORGE L. GOODALE, JOHN TROWBRIDGE,
W. G. FARLOW AND WM. M. DAVIS, OF Cambridge,

PROFESSORS ADDISON E. VERRILL, HORACE L. WELLS,
LOUIS V. PIRSSON, HERBERT E. GREGORY
AND HORACE S. UHLER, OF NEW HAVEN,

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

FOURTH SERIES

VOL. XLV-[WHOLE NUMBER, CXCV]

WITH FRONTISPIECE AND PLATES.

NEW HAVEN, CONNECTICUT.

1918.

THE TUTTLE, MOREHOUSE & TAYLOR COMPANY

NEW HAVEN.

CONTENTS TO VOLUME XLV.

Number 265.

Page

1

54

ART. I.—The Problem of the Cretaceous-Tertiary Boundary

in South America and the Stratigraphic Position of the

San Jorge-Formation in Patagonia; by A. WINDHAUSEN

II. On the Rate of Solution of Silver in Chromic Acid; by

R. G. VAN NAME and D. U. HILL

III.-Early Silurian Rocks of the Northern Peninsula of

Michigan; by T. E. SAVAGE and H. F. CROOKS....

IV.-A Second Meteorite Find in Florida; by G. P. MERRILL 64

V.-On Mullanite, a new Member of the Jamesonite Group,

from Two Localities; by E. V. SHANNON

SCIENTIFIC INTELLIGENCE.

59

66

Chemistry and Physics-Solubility of Bismuth Oxychloride in Hydrochloric

Acid and its Relation to Complex Formation, A. A. NOYES, F. W. HALL,

and J. A, BEATTIE: Revision of the Cobalti-Nitrite Method for the

Determination of Potash, C. R. HAFF and E. H. SCHWARTZ, 71.-Estima-

tion of Arsenic in Organic Compounds, A. J. EWINS: Calorimeter for

Measuring Heats of Dilution, D. A. MACINNES and J. M. BRAHAM, 72.-

Detection of Carbon in Inorganic and Organic Substances, E. MUELLER:

Extreme Ultra-Violet Spectra of Helium, Hydrogen, and Mercury, O. W.

RICHARDSON and C. B. BAZZON, 73.-Navigation, H. JACOBY, 74.-Practi-

cal Pyrometry, E. S. FERRY, G. A. SHOOK, and J. R. COLLINS, 75.- The

Mystery of Matter and Energy, A. C. CREHore, 76.

Geology-Structure of the Himalayas, and of the Gangetic Plain, as eluci-

dated by Geodetic Observations in India, R. D. OLDHAM, 76.-The Origin

and Evolution of Life, H. F. OSBORN, 77.-The Cretaceous Faunas of the

Northeastern Part of the South Island of New Zealand, H. WOODS:

New and Little Known Gastropods from the Upper Cretaceous of Ten-

nessee, B. WADE: The "Mark Stirrup" Collection of Fossil Insects from

the Coal Measures of Commentry (Allier), Central France, H. BOLTON:

Fossil Plants from Bolivia and their Bearing upon the Age of Uplift of

the Eastern Andes, E. W. BERRY, 78.-West Virginia Geological Survey,

I. C. WHITE: United States Bureau of Mines, Year Book for 1916, V. H.

MANNING, 79.

Obituary-E. HULL, 80.