PRESENTING the air estimates to Parliament on March 8, Sir Philip Sassoon, Under-Secretary of State for Air, outlined a programme of expansion of the R.A.F. which, while modest, is probably as large as can be undertaken with efficiency at the present time, remembering that previous economies have restricted both the training of personnel, and the provision of accommodation for additional squadrons. The net amount provided is £17,561,000, an increase of £135,000 over last year's figure. If grants from India and the Admiralty in respect of R.A.F. services to them are added, these figures become £20,165,000 and £527,000 respectively. Four new squadrons are to be formed, two for home defence, one flying boat squadron, and the equivalent of one squadron for the Fleet air arm. In addition, two home defence squadrons, at present forming part of an experimental station, and consequently non-effective as fighting units, are to be reconstituted as active squadrons. The principal increased expenditures are obviously to be made under Votes 3 (technical equipment), and 4 (works, buildings, lands, etc.). It is interesting to note that Vote 2 (non-technical stores) remains stationary, in spite of the expansions, due to lower prices. Vote 8 (civil aviation) stands at the highest figure for the last ten years. This includes expenditure upon the British Government part of the route to Australia, up to Singapore, the first link of the Atlantic service, New York to Bermuda, and the usual subsidies for flying activities in Great Britain. Sir Philip also gave an interesting account of the various developments of the R.A.F., including long distance communication flights, police duties and distress relief in remote lands, air surveying, etc. The use of petrol produced from British coal has been successful, and it is hoped to maintain seven squadrons upon it exclusively during the coming year.