relative to the Earth's Surface. 35 
18. The following table, se published by M. Schouw, and 
reduced here from millimetres to English inches, shows that 
there is a similar bulging of “Aly atmosphere in the middle lati- 
tudes and depression at the pole in the northern hemisphere, as 
has been observed in the southern hemisphere 
Place. Latitude. Pressure. Plaee. ' Latitude. Pressure, 
—_ 
inches. : inches. 
Cape, 38° 0’S. 80040 | London, 51° 30’ 29-961 
Rio Janeiro, 23 Ss. 80078 | Altona, 53 80 29°937 
Christianburg, 5 30 N. 29°925 | Dantzic, 54 380 29925. 
a Guayra, 10 29°928 Konigsberg, 54 30 29°941 
8t. Thomas, 19 29°941 nrade, 5 29°905 
acao, 30039 | Edinburgh, 56 29°851 
Teneriffe, z 80°087 | Christiana 60 29°866 
Madeira, 82 30 30°126 | Bergen, 60 29°703 
li, 33 30°213 | Hardanger, 60 29-700 
Palermo, 38 80°036 | Reikiavig, 64 29°607 
a 41 80°012 | Godthaab, 64 29°603 
Florence 43 30 29996 | Eyafiord, 66 29°669 
on, 0°000 | Godhaven, 69 29°674 
Bologna, 44 30 30008 | Upernavik, 73 29°732 | 
Padua, 45 88-008 | Mellville Isle, 74 30 29°807 
_ Paris, 49 29-976 | Spitzbergen, 75 30 29-795 | 
19. From the preceding tables, it is seen that the barometric 
pressure is much less, especially in the southern hemisphere, 
towards the poles than at the equator, although the density 
towards the poles is much greater, and hence the depression 
there must be considerable. 
20. It has been seen (§ 1), that, in consequence of the earth’s 
rotation, the interchanging motion of the atmosphere between 
the equator and the poles give rise toa force, by which this mo- 
tion itself i is counteracted. nibs instance, the motion toward the 
uses an eastward motion — 
motion toward the equator. The motion of the atmoupheisy 
refore, between the equator and the poles, is not pate by 
the whole force arising from the difference of density between 
the equator and the poles, but by a small difference only between 
the two forces. Hence if the earth had no rotatory motion, the 
force which produces this motion would be very much g 
and there-would be a sweeping hurricane from t pole t 
qua, 
21. Tt i 
pono 
have an 
@e 
