xxiv WINDS OF THE GLOBE. 



" Regarding the rate of rise or fall in the barometer during winds from each 

 point of compass, given in the preceding table, as the measure of the force that 

 produces it, and reducing these forces to a single force, in tiie usual way, we 

 obtain tlie results in the second, third, and fourth columns of the following table ; 

 to which I have added, in the fifth column, the mean direction of the wind.' The 

 aiTows within the inner circle of the Barometrical AVind-roses [Plate 23] exhibit 

 these results to the eye. 



TABLE II. 



Points of Maximum and Minimum Pressuee. 



Place of 



Poiut of maxi- 



Point of mini- 





Mean line o 





and 



Mean r 



1 



observation. 



mum p 



ressure. 



mum pressure. 





minimum pressure 





of wind. 1 



Ogdensburg, 



N. 



51" 



2' 



W. 



S. 58° 



14' 



E. 



N. 



54° 17' W. 



to S 54° 



17' E. 



S. 58° 



34' W. 



Newfoundland, 



N. 



35 



50 



W. 



S. 42 



12 



E. 



N. 



39 31 W. 



to S. 39 



31 E. 



S. 78 



4 W. 



Girard College, 



N. 



4 



4 



w. 



S. 53 



12 



E. 



N. 



44 57 W. 



to S. 44 



57 E. 



N.74 



5 W. 



Franklin Inst., 



N. 



50 



16 



w. 



S. 21 



10 



E. 



N. 



28 31 W. 



to S. 28 



31 E. 



S. 75 



4 W. 



Boston, 



N. 



28 



21 



w. 



S. 14 



39 



E. 



N. 



18 56 W. 



to S. 18 



56 E. 



N.88 



20 W. 



Nantucket, 



N. 



35 



37 



w. 



S. 48 



3 



E. 



N. 



42 36 W. 



to S. 42 



36 E. 



N. 77 



w. 



Bermuda, 



N. 



41 



32 



w. 



S. 36 



19 



E. 



N. 



39 22 W. 



to S. 39 



22 E. 



S. 45 



48 W. 



North Atlantic, 



N. 



54 



49 



w. 



S. 51 



31 



E. 



N. 



53 17 W. 



to S. 53 



17 E. 



S. 83 



25 W. 



Iceland, 



N. 



39 



18 



w. 



S. 48 



48 



E. 



N. 



45 11 W 



to S. 45 



11 E. 



N.86 



35 W. 



London, 



N. 



13 



55 



w. 



S. 17 



4 



E. 



N. 



15 38 W. 



to S. 15 



38 E. 



N.88 



38 W. 



Greenwich, 



N. 



34 



6 



w. 



S. 34 



4 



E. 



N. 



34 5 W. 



to S. 34 



5 E. 



S. 60 



14 W. 



Paris, 



N. 



51 



34 



w. 



S. 48 



48 



E. 



N. 



50 W 



to S. 50 



E. 



S. 70 



30 W. 



Dantzic, 



N. 



29 



48 



w. 



S. 6 



37 



E. 



N. 



20 5 W. 



to S. 20 



5 E. 



S. 68 



7 W. 



Ural Mountains, 



N. 



34 



51 



w. 



S. 29 



46 



E. 



N. 



32 18 W. 



to S. 32 



18 E. 



N. 83 



21 W. 



Barnoule, 



N. 



87 



11 



w. 



N.43 



49 



E. 



S. 



70 19 W. 



to N. 70 



19 E. 



S. 35 



3 W. 



Pekin, 



N. 



31 



47 



w. 



S. 54 



34 



E. 



N. 



45 10 W. 



to S. 45 



10 E. 



S. 74 



22 W. 



Russian America, 



S. 



30 



15 



w. 



N.29 



IG 



E. 



S. 



29 41 W. 



to N. 29 



41 E. • 



S. 55 



37 E. 



S. Ilemispliero, 



S. 



25 



21 



w. 



N. 9 



53 



W. 



S. 



10 22 W. 



to N. 10 



22 E. 



N.83 



44 W.' 



"The results shown in the foregoing tables and diagrams confirm all that I had 

 previously adduced, and establish conclusively, I think, the following facts, at 

 least in the zones of westerly winds. 



" 1st. That the horizon is divided by nature into two well-defined portions, the 

 winds from between the division points on the one side being all attended with a 

 rise in the barometer, and on the other with a fall. This is found true at all the 

 stations where there are reliable observations. Even where they are taken for 

 thirty-two points of the compass, there is no intermingling, 



" 2d. That in the northern hemisphere, one of these points lies in a southwesterly 

 direction, and the other in a northeasterly. Barnoule in Siberia, and Sitka in 

 Alaska, look like exceptions ; bvit at both these places the results were computed 



' The observations at sea were taken in various latitudes, and those on the direction of the wind 

 not reported; so that it was impossible to know accurately what mean direction to assign. But 

 taking into account the circumstances of the voyages during which they were taken, I have assumed, 

 as approximately correct for the southern hemisphere, one that I computed from a zone on Lieut. 

 Maury's charts, extending from lat. 40° to 45° S., and from long. 20° E. to 120° W. ; and for the 

 North Atlantic, one deduced from about twelve years' observations, taken north of lat. 36° 



