A M E R I C A N 



JOURNAL OF SCIENCE AND ARTS. 



[THIRD SERIES.] 



Art. l.~Contrihutions io Meteorology, heing Results derived from 

 an examination of the United /States Weather Maps and from 

 other sources ; by Elias Loomis, Professor of Natural Philoso- 

 phy in Yale College. Fourth paper. With Plate. 

 [Read before the National Academy of Sciences, Philadelphia, Nov. 2, 1875.] 



Movement of Areas of high barometer. 

 Having determined the average direction and velocity of 

 movement of areas of low barometer within the limits of the 

 United States, I desired to make a similar determination re- 

 specting areas of high barometer. As I have in my posvses- 

 sion only one Weather Map for each day, I have frequently 

 found it difficult to follow the course of areas of high barome- 



L month each, viz : 

 Aug., 1873, Dec, 1874, aSd Jan., 1875. The following are the 

 average courses and velocities of the areas of high barometer 

 for these months : 





|Co 







"High mlnuB Low. 



MONTHS. 



.,„.,..,.., 



course. iVelocity. 





.-.;E. 



ris. 





7°S.i -5-7 



SeTi;;-:::: 



..-'E.4 



-.|E. 1 



25S.i -0-8 



Mean 



-JB. 1 



2 S.j 24-8 



1 n sJ -v2 



. JouK. Sol— Thibd Sbbies, Vol. XI, ] 



