ained the principles exemplified
in the model here described, it may be expected that I should add a
few words regarding their reduction into practice upon a larger scale
and in the open air, with such difficulties to contend with as may be
expected to be encountered in the prosecution of such a design. In the
first place, however, it will be necessary to disabuse the public mind
of some very prevailing misconceptions with respect to the conditions
of a Balloon exposed to the action of the winds, pursuing its
course under the exercise of an inherent propulsive power. These
misconceptions, which, be it observed, are more or less equally
participated in by the scientific as by the ignorant, when devoid
of that practical experience which is the basis of all aeronautical
proficiency, are of a very vague and general character, and
consequently not very easy accurately to define. In order, therefore,
to make sure of meeting all the objections and removing all the doubts
to which they are calculated to give rise, it will be advisable, even
at the risk of a little tediousness, to separate them into distinct
questions and treat them accordingly.

One of the most specious of these misconceptions regards the effects
of the resistance of the atmosphere upon the figure of the Balloon
when rapidly propelled through the air, whereby it is presumed its
opposing front will be driven in, and more or less incapacitated from
performing the part assigned to it; namely, to cleave its way with the
reduced resistance due to its proper form. To obviate, this imagined
result, various remedies have been proposed--such as, to construct
that part of the machine of more solid materials than the rest, or
else (as suggested by one of the most scientific and ingenious of
those who have devoted their attention to the theory of aerial
navigation), to subject the gaseous contents of the Balloon to such a
degree of artificial condensation by compression, as shall supply
from within a force equal to that from without; adopting, of course,
materials of a stronger texture than those at present in use, for the
construction of the balloon. Now the contingency against which it is
here sought to provide, and which I grant is a very reasonable one to
anticipate, has nevertheless no real existence in practice; at least
in such a degree as to render it necessary to have recourse to any
particular expedient for its prevention. Taking it for granted that
the hypothes