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FIDELITY TRUST COMPANY Nos. 325-331 CHESTNUT ST. Nos. 43–53 SOUTH FOURTH ST.

Capital and Surplus, $15,000,000 Pays Interest on Deposits.

Executes Trusts of Every Description. Safes for Rent in Burglar-proof Vaults. Securities and Valuables Taken for Safe Keeping.

Wills Safely Kept Without Charge.

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TARR

Will dispose of sewage in a sanitary, odorless

and efficient manner at a cost for maintenance YSTEM OF

of 90% less than any other system and

100% EFFICIENCY. Endorsements by leading EWAGE DISPOSAL scientific men and various Health Boards on

file for your inspection. GREEN-STARR ENGINEERING CO. Civil and Sanitary Engineers

PERRY BUILDING, PHILADELPHIA, PA. Your courtesy in mentioning the Journal will be appreciated

“NICE" PAINTS, VARNISHES, FILLERS

For Every Purpose

EUGENE E. NICE, Mfr. 272-274 South Second Street

Philadelphia

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New Fourth Edition Revised and Enlarged

Suplee's Mechanical Engineer's

Reference Book

A Hand-book of Tables, Formulas, and Methods for

Engineers, Students and Draftsmen By Henry Harrison Suplee, B.Sc., M.E. Member American Society of Mechanical Engineers ; Membro de la Société De Ingenieurs Civils de France ; Mitglied des Vereines Deutscher Ingenieure;

Member of The Pranklin Instituto.

Illustrated. 964 pages. 16mo. Full limp leather, round corners,

gilt edges, thumb index. $5.00 net

THIS book is intended to form a standard hand-book 1 for the mechanical engineer and the designer of

machinery, supplying in convenient form the general information which is constantly required. In the new fourth edition the few errors in the previous edition have been corrected and an Appendix of forty pages added, containing a variety of useful information.

Several features make this the one up-to-date complete accurate work for mechanical engineers,-more space has been devoted to Mathematics than in any other similar reference book in English,—the subject of machine design is very amply treated,—the arrangement of the matter is unexcelled, and fully illustrated, which together with the complete thumb index, makes it just the book for quick reference.

Send for Bulletin of Nero Scionti fio Books

J. B. LIPPINCOTT COMPANY Publishers

Philadelphia

Your courtesy in mentioning the Journal will be appreciated

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The Franklin Institute

DEVOTED TO SCIENCE AND THE MECHANIC ARTS
Edited by R. B. OWENS, E.E., M.A., D.Sc., F.R.S.C.

ASSOCIATE EDITORS:
Brig. Gen. James Allen
Harry C. Jones, Ph.D.

Lt. Col. Goo. O. Squier, Ph.D.
Wilder D. Bancroft, Ph.D. Harry F. Keller, Ph.D.

C. P. Steinmetz, Ph.D.
John J. Carty, D.Sc.
Gaetano Lanza, C.E.

S. W. Stratton, Sc.D.
A. S. Cushman, Ph.D.
Ralph Modjeski, D.Eng.

Admiral D, W. Taylor
Louis Duncan, Ph.D.
L. A. Osborne, M.E.

S. M. Vauclain, Sc.D.
A. S. Eve, D.Sc.
Albert Sauveur, B.S.

R.S. Woodward, Ph.D.
W. J. Humphreys, Ph.D. Edgar F. Smith, Ph.D.

A. F. Zahm, Ph.D.
COMMITTEE ON PUBLICATIONS:

Louis E. Levy, Chairman
George A. Hoadley

W.C. L. Eglio

Geo. D. Rosengarten E. H. Sanborn
Vol. CLXXX
NOVEMBER, 1915

No. 5

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Contents
The Production of Light by Animals. By Ulric Dahlgren . . .

513
Recent Researches in Electricity at the Bureau of Standards. By E, B. Rosa
Early Municipal Water Works at Panama. By Carleton E Davis ..
The Conductivity and Viscosity of Solutions of Electrolytes in Formamid.

By P. B. Davis, W. S. Putnam, and Harry C. Jones . . . . . . . . 567
On the Retention of Activity by Urease and by Oxidase after Exposure to

the Temperature of Liquid Air. By Joseph Samuel Hepburn and Charles
Blizard Bazzoni . . .

. . . . . . . . . . .
Notes from the U. S. Bureau of Standards:

A New Relation from Planck's Law .
The Microstructural Changes Accompanying the Annealing of Bronze (Cu88,
Sn10, Zn2) . .

. .. .
Compressive Strength of Portland Cemeni Mortars and Concretes'
Standard Test Specimen of Zinc Bronze (Cu88, Sn10, Zn2). Part II — Micro-
structure . . . . .

613
Earth Resistance and its Relation to the Electrolysis of Underground Structures
Foreign Specifications for Railway Material . . . . . . . . . .

615 Notes from Nela Research Laboratory:

The Relation between Spectral Color and Stimulation in the Lower Organisms. 617

Temperature and Blackening Effects in Helical Tungsten Filaments . . . . 619
The Franklin Institute:
Stated Meeting, October 20, 1915.

623
Committee on Science and the Arts, Stated Meeting. October 6. 1915.

624
Section of Physics and Chemistry, Stated Meetings, October 7 and October 14,
1915

624
Minute of the Board of Managers on the Death of John T. Morris : : :
M embership Notes . . . . . . . . . . . . . . . . . 626

Library Notes . . . . . . . . . . . . . . . . 627
Book Notices . . . . . . . . . . . . . . . . . . . 630
Publications Received . . .
Current Topics ...537, 538, 560, 566, 601, 602, 606, 621, 622, 632, 633
Announcements.

xi-xx
Published by
THE FRANKLIN INSTITUTE OF THE STATE OF PENNSYLVANIA,

PHILADELPHIA
FIVE DOLLARS PER YEAR (Foreign Postage Additional). SINGLE NUMBERS, FIFTY CENTS.

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Entered at the Post office at Philadelphia, Pa., as second-class matter.

Copyright, 1915. by THE FRANKLIN INSTITUTE.

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