The Cosmos Press

EDW. W. WHEELER

CAMBRIDGE, MASS.

CONTENTS.

I. On the Ultra Violet Component in Artificial Light. BY LOUIS

BELL

II. Alexander Agassiz. BY HENRY P. WALCOTT

III. A Theory of Linear Distance and Angle. By H. B. PHILLIPS

and C. L. E. MOORE

IV. Preliminary Diagnoses of New Species of Chaetomium. BY A.

H. CHIVERS

V. A Study with the Echelon Spectroscope of Certain Lines in the

Spectra of the Zinc Arc and Spark at Atmospheric Pressure.

BY NORTON A. Kent

VI. The Impedance of Telephone Receivers as affected by the Motion

of their Diaphragms. BY A. E. KENNELLY and G. W. PIERCE

VII. New or Critical Laboulbeniales from the Argentine. BY ROLAND

THAXTER

VIII. Culture Studies of Fungi producing Bulbils and Similar Propaga-

tive Bodies. By J. W. HOTSON

IX. Thermodynamic Properties of Liquid Water to 80° and 12000

Kgm. BY P. W. BRIDGMAN

X. Preliminary Descriptions of New Species of Rickia and Treno-

myces. BY ROLAND THAXTER

XI. The Space-Time Manifold of Relativity. The Non-Euclidean

Geometry of Mechanics and Electromagnetics. By E. B.

WILSON and G. N. LEWIS

PAGE

V

XIII. The History, Comparative Anatomy and Evolution of the Arau-

carioxylon Type. BY E. C. JEFFREY

1

31

45

81

91

111

155

225

307

387

XII. On the Existence and Properties of the Ether. BY D. L. WEBSTER 509

363

531

XIV. The Action of Sulphur Trioxide on Silicon Tetrachloride. BY

C. R. SANGER and E. R. RIEGEL

573

XV. An Electric Heater and Automatic Thermostat. BY A. L. CLARK 597

XVI. Cretaceous Pityoxyia from Cliffwood, New Jersey. BY RUTH

HOLDEN

XVII. On the Scalar Functions of Hyper Complex Numbers. By

HENRY TABER

XVIII. Preliminary Study of the Salinity of Sea Water in the Bermudas.

BY K. L. MARK

XIX. On Certain Fragments of the Pre-Socratics: Critical Notes and

Elucidations. By W. A. HEIDEL

XX. The Structure of the Gorgonian Coral Pseudoplexaura crassa

Wright and Studer. By W. M. CHESTER.

XXI. RECORDS OF MEETINGS

BIOGRAPHICAL NOTICES:

Robert Amory. BY R. H. FITZ

Abbott Lawrence Rotch. BY R. DEC. WARD

Charles Robert Sanger. By. C. L. JACKSON

OFFICERS AND COMMITTEES FOR 1913-14

LIST OF FELLOWS AND FOREIGN HONORARY MEMBERS

STATUTES AND STANDING VOTES

RUMFORD PREMIUM

INDEX

607

625

666

679

735

777

805

807

813

823

825

839

853

855

48-1

Proceedings of the American Academy of Arts and Sciences.

VOL. XLVIII. No. 1.-MAY, 1912.

ON THE ULTRA VIOLET COMPONENT IN ARTIFICIAL

LIGHT.

BY LOUIS BELL.

WITH TWO PLATES

INVESTIGATIONS ON LIGHT AND HEAT PUBLISHED WITH AID FROM THE
RUMFORD FUND.

1.

VOLUME 48.

BELL, LOUIS.- On the Ultra Violet Component in Artificial Light. 2 pls. May, 1912. 40c.

pp. 1-29.