


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

Twentieth Volume Begins JANUARY 1905 
PUBLISHED MONTHLY ANNUAL SUBSCRIPTION $5.00 
SAMPLE COPY UPON REQUEST 
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THE AMERICAN JOURNAL OF SCIENCE 
Established by BENJAMIN SILLIMAN in 1818 

The Leading Scientific Journal in the United States 
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W. G. FARLOW, and WM. IS, o bridge; er 
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Mr. ‘Washington 


ics. DILLER, of 
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1895. A Aeon ee commenced in January, 1896. — Ser 
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