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Of the good work accomplished by our naval and military ﬂying men, and it is for this reason I have thought it provident to issue a volume likely to appeal to that section of the public which is now taking a new interest in aviation. It will be seen, therefore, that this book pretends to be nothing more than an element ary introduction suitable for the lay mind, and I would urge this point upon those critics whose technical knowledge may warrant respect, lest they in their haste should judge me harshly. The public cares nothing for the value of x. Those members of the community who do, have already sufficient volumes at their disposal to satisfy their curiosity.