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The Cosmos Press
EDW. W. WHEELER
CAMBRIDGE, MASS.
V
CONTENTS.
PAGE
I. On the Ultra Violet Component in Artificial Light. BY LOUIS
BELL
II. Alexander Agassiz. BY HENRY P. WALCOTT
1
31
III. A Theory of Linear Distance and Angle. By H. B. PHILLIPS
and C. L. E. MOORE
45
IV. Preliminary Diagnoses of New Species of Chaetomium. BY A.
H. CHIVERS
81
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
91
111
THAXTER
155
VIII. Culture Studies of Fungi producing Bulbils and Similar Propaga-
tive Bodies. By J. W. HOTSON
225
IX. Thermodynamic Properties of Liquid Water to 80° and 12000
Kgm. By P. W. BRIDGMAN
307
X. Preliminary Descriptions of New Species of Rickia and Treno-
myces. BY ROLAND THAXTER
363
XI. The Space-Time Manifold of Relativity. The Non-Euclidean
Geometry of Mechanics and Electromagnetics. BY E. B.
WILSON and G. N. LEWIS.
387
XII. On the Existence and Properties of the Ether. BY D. L. WEBSTER 509
XIII. The History, Comparative Anatomy and Evolution of the Arau-
carioxylon Type. BY E. C. JEFFREY
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
607
XVII. On the Scalar Functions of Hyper Complex Numbers. BY
HENRY TABER
625
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
666
679
XX. The Structure of the Gorgonian Coral Pseudoplexaura crassa
Wright and Studer. By W. M. CHESTER .
735
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.
VOLUME 48.
1.
BELL, LOUIS.- On the Ultra Violet Component in Artificial Light. pp. 1-29. 2 pls. May, 1912. 40c.