DYNAMIC METEOKOLOGY. 



369 



In order to fletermine the same {[uantities also for tlie storms of the 

 United States, Loomis has chosen thirty-six charts for cyck)nes and 

 thirty six for anti-cyclones ont of the twelve thousand published by 

 the Sij?nal Office since November, 1871, whicli gave him the following 

 table of results. The mean latitude of the centos of these cyclones was 

 44°.7 north, that of the anticyclones 45°.! north. 



Loomis's tvind and barometric gradients within the United States. 



U, Mis, 143 — -24 



