The most interesting type of flying machine for sport and pleasure is the hydroaeroplane, and this is undoubtedly the machine with the greatest possibilities for the future. Indeed, it opens up an entirely new region of activity, as boundless as the ocean itself, and as various as the different bodies of water. Built along the lines of a motor boat with the addition of aeroplane surfaces or horizontal sails, this craft will be used for much the same purposes as motor boats are now, but in ways immeasurably more varied and more effective. The boat portion will be made large and comfortable for pleasure trips and will be a veritable sportsman's machine which can be run up to a dock where it can make an easy landing and be tied up when not anchored out from shore. There will be a comfortable cabin, with cushioned seats for the navigators, and celluloid windows will be placed in the planes, so that the view below will not be obstructed. It will be handled in heavy seas without difficulty. With such an air and water craft you can go off hunting or fishing; you can shoot ducks and you will not have to wait until Mr. Duck comes by but you will be able to reverse the present custom and chase him in his native element and overtake him, too, as you would a fox on horseback. By rising to a good height you can see schools of fish or good places on the bottom to cast your lines for fishing. Inland lakes will be just the place for the water machine and even among the mountains the surface of lakes will offer ideal places for landing and starting, even where the shores are quite out of the question for safe flying ground. The construction of the hydroaeroplane, while keeping on the same general lines of development, will adapt itself to the exigencies arising from its extended uses. The propeller or propellers will be protected from the flying spray which might break them for small drops of water are like bullets out of a gun when hit by the rapidly revolving blades of the propeller which travel so fast that water might just as well be solid matter as far as getting out of the way is concerned. Spray will chip pieces right out of a wooden propeller. Propeller blades are now covered with tin on the tips for use on the water, and even metal blades may be better in some respects for this purpose. The control and rudders are placed on the rear of the long light boat, which extends further to the rear to accommodate them. The radius of action in the hydroaeroplane is now from four hundred to five hundred miles, for the machine can carry a barrel of gasoline, or fifty-two gallons, and as the engine uses about seven gallons an hour this would mean about seven hours running at from fifty to sixty miles an hour in still air; if the wind were blowing twenty-five miles an hour in the direction in which the machine was flying it would add two hundred and fifty miles to the distance covered in ten hours.