360 
PHILOSOPHICAL SOCIETY OP WASHINGTON. 
sion of the physical characteristics of “shadow bands,” and an 
explanation of how the earth’s atmosphere acts to produce them, 
and, secondly, a discussion of the meteorological observations 
treating of the fall of temperature, the fall of relative humidity, 
and the decrease of the amount of heat in the atmosphere during 
the eclipse of the sun. The subject of the paper was discussed 
with the author by Messrs. Putnam, Baker, and Strother. 
[Published in Weather Bureau Bulletin I, (W. B. No. 267) 
1902.] 
Mr. G. W. Littlehales presented a paper entitled The dis¬ 
placement of moored objects by ocean currents; this was a mathe¬ 
matical discussion of the amount of error that must be allowed 
for in the length of a precise sea-course marked out by buoys in 
the open ocean for use in the trials of the speed of ships. [Not 
published.] 
Mr. G. E. Putnam read a paper entitled A recent connection 
between the gravity-stations of Europe and America, which was 
a statement of the results of the recent refined measurements of 
the value of the force of gravity that have been made, by the 
author and other eminent physicists, at our own and several 
European capitals. [Published in fuller form in TJ. S. Coast and 
Geodetic Survey Report for 1901, Appendix 5.] 
Professor Gore told of the high regard in which Mr. Putnam’s 
work is held by Professor Helmert.. 
523d Meeting. November 10, 1900. 
President Sternberg in the chair. 
Sixty-one persons present. 
The programme of the evening was devoted entirely to reports 
on the Paris Exposition of 1900, mostly by invited speakers. 
Mr. J. H. Gore discussed the circumstances that led to the 
Paris Exposition and described the formation and duties of the 
jury of awards. He also described the general plan and loca¬ 
tion of the buildings and exhibited a number of slides illus¬ 
trating exterior and interior views of many of the buildings. 
