it Beith: 
310 Mr. Redfield’s Reply to Dr. Hare. 
eastward,” or “nearly at right angles” to its first course; accord- 
ing to the descriptions and plan of Prof. Bache, who gives the 
course of the axis as “east 10° N.,” the building being to the 
southward or on the right of this line. 
I say nothing here of the protection afforded by “an edifice” 
which after the first moment, according to the hypothesis of mo- 
tion adopted by Messrs. Espy and Hare, was constantly more or 
less to leeward of the building so protected. By applying to 
Prof. B.’s plan, as before, a compass card, moved from west to east 
without revolving, we shall find their wind to commence nearly 
at east, passing thence through south to southwest, and possibly 
to west southwest, near which it would terminate. Thus, the 
first effects of the wind, when, even upon the hypothesis of “suc- 
tion,” the building was unprotected, could not produce the first 
motion in the direction “ to the west of north,” which may per- 
haps be fairly taken at 5° or 10° west of north; and the wind, 
on their hypothesis, would hardly appear to have reached a point 
which could produce the second movement “to the east.” 
I have been thus particular in this examination, because the case 
thus alleged by Dr. Hare is a further specimen of the erroneous 
inductions which have been made and relied on by my opponents. 
In examining the plans referred to, it should be observed, that 
the sketch of prostrations in the orchard, which is included in 
fig. 3, is evidently on a more reduced scale than that given in the 
plan of the building ; otherwise, the buildings must be of size 
sufficient nearly to have covered the orchard. This change of 
scale may cause some confusion unless particularly noticed. 
That the velocity and consequent force of the whirling move- 
ment of the tornado is maintained by the direct pressure of the 
surrounding atmosphere, rather than by the “ suction” alleged by 
Dr. H. I can readily conceive; but that the “impulse of a whirl- 
wind” of this character is generally found to be “tangential” to 
its axis, which he seems to considera necessary condition, I do 
not admit. 
Dr. Hare appears to concede, that my survey of this tornado 
shows effects which accord with whirlwind action ; but he seems 
desirous of limiting this admission to the prostration of “certain 
trees,” and alleges that this survey “does not demonstrate gyt@- 
tion to be an essential feature of tornadoes,” and that “it is suffi- 
ciently accounted for by considering it as a fortuitous consequence 
