PROFESSORS ASA GRAY, LOUIS AGASSIZ, AND
WOLCOTT GIBBS, OF CAMBRIDGE,

AND

PROFESSORS S. W. JOHNSON, GEO. J. BRUSH, AND
H. A. NEWTON, OF NEW HAVEN.

SECOND SERIES.

VOL. XLI.-[WHOLE NUMBER, XCI.]

Nos. 121, 122, 123.

JANUARY, MARCH, MAY, 1866.

NEW HAVEN: EDITORS.

1866.

PRINTED BY E. HAYES, 426 CHAPEL ST.

CONTENTS OF VOLUME XLI.

NUMBER CXXI.

ART. I. Sir William Jackson Hooker,

II. On a boulder, and Glacial Scratches, at Englewood, N. J.;

by Rev. W. B. DWIGHT,

III. On a Subsidence of land at Coxsackie, N. Y.; by Rev. W. B.

DWIGHT,

IV. On the Crystalline Nature of Glass; by CHARLES M.

WETHERILL, Ph.D., M.D.,

Page.

1

10

12

V. Contributions from the Sheffield Laboratory of Yale Col-

lege. No. IX. On the assimilation of complex nitrogenous

bodies by Vegetation; by S. W. JOHNSON,

VI. Results of observations on the Drift Phenomena of Labrador

and the Atlantic coast southward; by A. S. PACKARD, Jr., M.D.

VII. On a Process of Elementary Analysis admitting of the de-

termination of Carbon, Hydrogen and Nitrogen at a single

combustion; by C. GILBERT WHEELER,

VIII. On a new Process for the determination of Sulphur in Or-

ganic Compounds, by combustion with Oxygen Gas and Per-

oxyd of Lead; by C. M. WARREN,

IX. Description of an Automatic Registering and Printing Ba-

rometer; by G. W. HOUGH, A.M.,

X. Observations upon Shooting Stars in November, 1865,

XI. On Molecular Physics; by Prof. W. A. NORTON,

XII. The Distribution and Migrations of North American Birds;

16

27

30

33

*40

43

58

61

XIII. Experiments on Mechanical Polarity; by PLINY EARLE

CHASE, M.A.,

XIV. Notice of a new group of Eocene Shells; by T. A. Conrad,

XV. Professor Treadwell's Improvements in constructing Cannon;

Address of the President of the American Academy of Arts

and Sciences (Prof. ASA GRAY) upon the presentation of the

Rumford Medal to Professor TREADWELL,

97