AMERICAN JOURNAL OF SCIENCE. 
‘ 
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ce a 
[THIRD SERIES] *# 
ART. L — Contributions to Meteorology: being results derived from 
Un 
an examination of the ina > of the United States Signal 
With a 
[Read before the National Academy of Sciences, Philadelphia, Nov. 15, 1881.] 
m ; by Extas 
of palin Philosdoky in Yate Colton Sixteenth paper. 
dap. 
Mean annual rain-fall for different countries of the globe. 
and how much to geretee causes. The influence of general 
causes is sometimes best shown by the averages derived from 
a large number of cases, by which means the peculiarities of 
particular storms are mostly eliminated. ith this view 
rain for the entire globe. A comparison of the mean annual — 
rain-fall for different localities shows unequivocally the influ- 
ence of general causes quite distinct from the peculiarities of 
particular storms. These general causes must operate upon eac 
storm, and a distinct understanding of their nature must assist 
Am, Jour. a Serigs, Vou. XXIII, No. 133.—January, 1882, 
