Rate of the Storm’s Progression. 11 
The progression of the gale, as in former cases, appears to have 
been greatly accelerated after it passed the axis of equal diurnal 
motion, on its recurvated course through the temperate and higher 
latitudes. ‘The following estimates are roughly made, by set- 
ting off the progression on the Chart, as shown in trace xxiv, 
reckoning in English miles, at seventy for a degree of the me- 
From a point opposite the position of the William Money (1) 
to that opposite the Hermann (3) 
Hours. Miles. Ay. per hour. 
84 1942 22 
mT position of Ove Bird (8) 50 980 19°6 
Georgia (20 62 814 13 
‘ Addy Swift (27) 7 175 25 
“8 Independent (49) 36 1102 30°6 
= Avalanche (90) 30 1505 50 
¥ Virginia (104) 15 (?) 758 50°6 (?) 
284 7276 
and unstable mobility of the latter, the great storms of the inter-tropical regions 
must necessarily have a westerly progression; the rate of which denotes the exist- 
ing difference of the diurnal motion. It is shown also by numerous investigatio vio 
hat ¢ stwar ower 
orm re esa 
and that of the Jower incumbent se mc equal. This line, or wpe 7 call the 
Chart. On crossing > 0 he lower 
atmosphere is found o exceed that of the earth’s marines an Petineet a relative 
movement from the west, which, combined with the continued m ent from th 
equator, determines the route of the storm through t the temperate “latit udes, 
is prevailing tendency or movement from the equator, in the inferior =_— 
seasons 
g 
oO 
=e 
of i ni 
‘ lose cases where the easterly and westerly currents of roto are less act- 
hand in other words, when the diurnal motion of the pbc oe is least un- 
1 eas 
y 
he storm becomes greatly modified, in degree, though subject to the same gene- 
ral law of planetary iptamie y, “ This ma’ ~~ seen exemplified on a ha 
nse 
0 . 
, Would a it to the lower winds and currents so far only as to include an eleva- 
Pac usand, to 5 six thousand i feet above the surface. The latter will prob- 
