22 AUGUST 1914, Page 25

Sea, Land, and Air Strategy. By Sir George Aston. (John

Murray. 10a 6d. net.)—The title of Sir George Aston's lucid and timely treatise shows what a remarkable advance has been vade in warfare since he published his well-known and valued Letters on Amphibious Wars. An entirely new arm, with a new field of operations, has made its appearance in the last five years, and Sir George Aston devotes a special chapter to considering the question " whether recent developments in the art of flying compel us to study strategy in three dimensions." He concludes that at present the few hundred aircraft at the disposal of any Power cannot in themselves bring any serious pressure to bear on a hostile nation, though the appearance of bomb-dropping aeroplanes might create temporary local panics. But as scouts aircraft may be of the utmost importance—e.g., in enabling an Admiral to locate hostile fleets, especially when the latter choose to remain in unapproachable harbours, or in aiding a General to find out, as Wellington used to say, " what is on the other side of the hill." The book is one to the consideration of which we mean to return.