
THE => 
PHYSICAL REVIEW 
A JOURNAL OF EXPERIMENTAL AND 
THEORETICAL PHYSICS 
American Physical Society 
EDWARD L. NICHOLS 
ERNEST MERRITT, AND FREDERICK BEDELL 

Twentieth Volume Begins JANUARY 1905 
PUBLISHED MONTHLY ANNUAL SUBSCRIPTION $5.00 
SAMPLE COPY UPON REQUEST 
THE MacMILLAN COMPANY, 
66 FIFTH AVENUE, NEW YORK 
THE AMERICAN JOURNAL OF SCIENCE 
Established by BENJAMIN SILLIMAN in 1818 



The Leading Scientific Journal in the United ‘States 
Devoted to the Physical and Natural Sciences, with special reference to Physics 
and Chemistry on the one hand, and to Geology and Mineralogy on the other. 
Editor: EDWARD S. DANA 
Associate Editors: PROFESSOR DE = oe JOHN TROWBRIDGE, 
WM. M. DAVIS, o 
Pnorzssons A. E. VERRILL, HENRY = WI LLIAMS, pe A Sis a of New Hek; - 
Pro 

, Prorgssor G. F. BARKER, of Philadelphia; Proressor JOS S. AMES, of Baltimore; — 
ot ii : eee 
FN: DILLEN. of Was 
Two volumes annually, in monthly nu soem of about 8o pages, e 
ended its frst series of 50 volumes as a leer: in sa: ; its menk 
Thi: 
of 50 volumes as a two-monthly in ier its third series as a mo monthl ended December, 
on = = eg SERIES commenced in January, 1896. Lee 
m price $6.00 per url or 5o cents a number, postage pre prepaid i in the or 5 
States "3540 = ee subserib bid in the P. EOM X few sets. on adr : 
= or the secon id Dura: 
= AMERICAN JOURNAL OF SCIENCE 
NEW HAVEN, CONN. 



