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Rh Looking back to the time at which the original articles were penned, it must be admitted that very great progress has been made, progress not only in the number and quality of the belligerent aeroplanes, but also more generally in the understanding of the potential capabilities of the Aeronautical Arm; the author finds, however, that his own ideas also have developed and expanded; the experience gained has, in a sense, cleared our vision, and enabled us to look still further into the future. Thus, in spite of the great advance, the pressing needs of the future seem in no wise diminished.

The author in conclusion desires to acknowledge his debt of gratitude to Maj.-Gen. Sir David Henderson, K.C.B., to whom the preface of the present volume is due. He counts himself singularly fortunate in having been accorded the support of so great an authority on Military Aeronautics, and feels confident that his gratitude will be shared by those into whose hands this book may fall.

Birmingham, November, 1915.