WINDS OF THE GLOBE. 



quently there are but few places where we have the requisite data. The former 

 of these instruments it has been found difficult to construct so as to work satis- 

 factorily. 



" My first effort as to tlie problem was made in the year 1837, at Ogdensburg, 

 N. Y., where I erected a self-registering vane, and made arrangements for frequent 

 observations of the barometer. The definiteness of the result surprised me. It 

 divided the horizon into two perfectly distinct portions, the winds from one of 

 which were attended with an average rise of the barometer, and those from the 

 otiier with a fall. And although my vane registered from 32 points of the com- 

 pass, there was no intermingling of the points in the result. But was the law 

 that I had thus discovered, a general one ] Or, was it owing to something pecu- 

 liar to that locality 1 To test this, I proceeded to make similar computations for 

 twelve other places in this country and elsewhere, according as the observations to 

 which I had access furnished data applicable to the purpose, and while so em- 

 ployed I found that Prof. Dov(^, of Berlin, had done the same for five places more, 

 which I united with my own, making eighteen in all. [These are delineated in 

 Plate 23.] 



"Early in these investigations the question arose whether the results favored the 

 rotary or centripetal theory of storms ; the indications were that the motion was 

 both rotary and centripetal. I was not then fully prepared to submit what I had 

 oftered for publication, except in outline, and I deferred to do so. Since 1853 

 I liave added nothing to it, except the results of Dr. Louis Berlandier's observa- 

 tions at Matamoras in Mexico. The following gives in a tabular form the results 

 of all the observations since that date : — 



TABLE I. 



Showing the Average Rate op Rise oe Fall of the Barometer, in Decimals of an Inch, per 

 twenty-four hours during winds from different points of compass. 







Fraukliu 



Iceland, 





B igislowk, 



Pekin, 



Barnoule, 



Sitka, Rus. 







Inst., Phila., 



June 1, 





Ural Hts., 



China, 



Siberia, Jan. 



America, 



Course. 



Boston, 



1S39, 1841 



1811, to 



London, 



Jan. 1 to 



April and 



and Feb. 



April, 1842. 





4 mouths. 



aud 1842 in 



June 1, 



3 yeais." 



Aug. 1, 1838. 



-May, 1842. 



1838. 









part. 



1812. 













N. 



+.014 



+ .021 



+.131 



+.098 



+.055 



+.174 



—.133 



—.280 



N. E. 



—.003 



+ .003 



—.063 



+.036 



—.016 



—.052 



—.147 



—.200 



E. 



—.025 



—.099 



—.169 



—.024 



—.013 



—.225 



—.004 



—.074 



S. E. 



—.109 



-.102 



—.235 



—.098 



-.064 



—.191 



—.085 



+ .032 



S. 



—.083 



—.171 



—.175 



—.096 



—.078 



—.133 



+.026 



+.189 



s. w. 



—.057 



—.105 



—.043 



—.049 



—.005 



—.043 



+.094 



+.185 



w. 



+ .000 



+ .042 



+.102 



+ .022 



+.022 



+.080 



+.122 



+.077 



N. W. 



+.010 



+ .084 



+.125 



+ .064 



+.076 



+.102 



+.149 



+.016 



