Note page 160 * First Report on Imperial Air Mail Services by the “Civil Aviation Advisory Board,” published by H.M. Stationery Office.

Note page 168 * “The Effect of a Variation in Load Factor Upon Structural Weight and Performance of an Aeroplane.” By A. J. S. Pippard, M.B.E., D.Sc.

Note page 176 * R. & M. 465. “Tests of a Model of the ‘Weasel’ Aeroplane Body.” By H. B. Irving, B.Sc.

† R. & M. 659. “Full-Scale Determination of the Lift and Drag Coefficients of Biplanes by Means of Engine and Airscrew Performance.” By the Aerodynamics Staff of the R.A.E.

‡ R. & M. 798. “A Comparison ol the Rates of Heat Dissipation of an Understrung and Nose Radiator on S.E.5. (S.E.5A and S.F.5B.)” By the Aerodynamics Staff of the R.A.E.

§ R. & M. “Experiments on the Resistance and Cooling of Radiators.” By L. W. Bryant and H. B. Irving

Note page 194 * R. & M. 829. “Experiments With a Family of Airscrews, including the Effect of Tractor and Pusher Bodies.” Part I. By A. Fage, C. N. H. Lock, R. G. Howard, and H. Bateman.

Note page 203 * This figure was originally adopted to meet the average requirements of the route, such as allowance for flight against head winds, etc.

Note page 204 * This figure was obtained from the type test reports of the Air Ministry, but modifications to tho machine have since reduced this 10 1,4501b.

Note page 206 * See “Fuel Economy in Flight,” by H. T. Tizard, in the Wilbur Wright Memorial Lecture for 1925.