23 MAY 1914, Page 26

How to Understand Aeroplane. By S. L. Walkden. (P. Marshall

and Co. is. net.)—A great advance in the manufactum and use of aeroplanes took place in the autumn of 1912. " Learning to fly was transformed from an accom- plishment of the acrobatic few, to be acquired only after weeks of labour and anxiety, into something as easy as lesinitig to ride a bicycle." In this practical little book Mr. Walkden shows how this change came about All who are -interested in flight should read his lucid explanations.