. Review of reviews and world's work . n Morocco, using Voisin bombing biplanes flewfrom Meknes to Bou Denib, crossing both theMiddle Atlas and the High Atlas. The follow-ing day three small Nieuport pursuit-type bi-planes made the return flight from Bou Denib toMeknes. One of the aviators continued on toRabat. It was a flight of about 260 miles eachway at heights of about 15,000 feet, because partsof the High Atlas are from 12,000 to 14,000 feethigh. It was made successfully in a little overthree hours. Previously Lieutenant Vasseur hadcrossed the High Atlas from Agadir and Marra-kech. The mo
. Review of reviews and world's work . n Morocco, using Voisin bombing biplanes flewfrom Meknes to Bou Denib, crossing both theMiddle Atlas and the High Atlas. The follow-ing day three small Nieuport pursuit-type bi-planes made the return flight from Bou Denib toMeknes. One of the aviators continued on toRabat. It was a flight of about 260 miles eachway at heights of about 15,000 feet, because partsof the High Atlas are from 12,000 to 14,000 feethigh. It was made successfully in a little overthree hours. Previously Lieutenant Vasseur hadcrossed the High Atlas from Agadir and Marra-kech. The mountain flying that has already beenaccomplished encourages aviator and geographerto look towards the conquest of the loftiest andleast attainable of the worlds ranges—theHimalaya. • It is evident that mountain flying involvesdifferent requirements from those presentedby the two prospective aeronautical featsupon which popular interest is just now cen-tered, viz, transatlantic flight and the air-plane expeditions to the North CRKATOKS OK A XKVV WORLDS ALTlTUUli RIXORD FOR AKROPLANKS (30,500 FKKT) : CAPT, ANDRKW LANG, R, A. F. (left), AND LIEUTENANT BLOWES 540 THE AMERICAN REVIEW OF REVIEWS In Arctic exploration and transatlantic flight?we have three requirements to be met: (1) A sustained flight, twice as long as thelongest yet made. (2) From ten to twenty-five hours continuousservice of the pilots on the airplane. (3) The use of instruments for determiningthe course when astronomical observations,shooting the horizon, and ascertaining the air-planes speed and drift are, to put it mildly,difficult. In crossing the Himalaya the cardinal re-quirement is to attain a sufficiently greataltitude. There are three aspects of such anundertaking to be considered: (1) Crossing the mountains by flying throughthe passes or gorges or by passage over the mainrange and avoidance of the high peaks. (2) Flying over the highest peaks, includingMt. Everest, which is 29,002 feet, and Mt.
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