Additional Objections to Redjfield’s Theory of Storms. 127 
upon the trade, or to these causes amnion 2 om Pieris Vol. 
“x, p. 48.) 
50. I trust it will be. saiciantly evident, that although yous 
and regularly moving masses of air, by encountering obstructions, 
may undergo a transient deflection, and that a portion accidentally 
caught ina strait with high cliffs on either side might. like the 
tide in the Bay of Fundy, acquire a local.and .temporary. accele- 
ration, yet that it would be utterly impossible for a durable whirl- 
wind to be thus excited. Obviously for the endurance of a whirl, 
if not for its production, the continuous application of at least two 
forces would be requisite, of which one must be endowed with 
a centripetal efficacy in order to counteract the concomitant cen= 
trifugal momentum. _ It will be evident that although a local ob- 
struction. may cause an eddy or whirl in its vicinity, the rotary 
momentum thus created must soon be exhausted. But admit- 
ting that a blast by being-deflected by an island could become a 
permanent whirlwind, obviously the resulting velocity could not 
beso great as that of the generating current. The moderately 
blowing trade wind could not, by contact with an inert body, ae- 
quire an increase of velocity adequate to form a furious hurricane 
capable, as en of secetstee pepmarecis for more than 
two thousand. miles... 
51. The menage once created, agreeably to to rete ican hihbiai 
ribed in the _fol- 
view Ato These storms cover, at the same moment 
time, an extent of contiguous surface, the diameter of which may 
vary from one to five hundred miles, und: Petes a Ce allah been 
"I'D, poy t nee tb 
much more extensive. They act 
the exterior, and with sang energy towards the interior of the 
space which they occupy.” (‘This Journal, Vol. xxv, p. 114.) 
» 62. Thus.it is mise thata, mass of air from ‘one to five hun- 
dred miles in diameter’ to whirl with the velocity of a 
cw Ff 
most furious gale, is not only ‘ “ unresisted” a 
ee mountains, which it “a PON but is 
JaL Pe Rp pore 
ahi Pe cs 
