The Japanese in modern times were first to resort to the forerunner of armor. They used shields of steel and in the siege of Port Arthur such shields were strapped to the front of the body. The Germans in the charges have frequently used double shields, advancing in groups of four behind a steel protector carried by two men, leaving the other two free to fire at the enemy through port holes in the armor shields. None of the armors has, however, proved its resistance to the high velocity bullets which the powerful field guns rain against it. Experiments are being made continuously along these lines, and Guy Otis Brewster, of New Jersey, has developed a bullet-proof jacket and headgear which it is said approximates perfection. In the presence of ordinance officers from the Picatinny Arsenal he invited an expert military marksman to fire at him from a distance of 60 yards. A Springfield rifle was used, with regulation ammunition. The steel bullet had a velocity of 2740 feet a second. Only one shot was fired, but it failed to penetrate the armor. COMPOSITION A SECRET. The composition of the latter is a secret, beyond the fact that it consists in part of steel. Jacket and headgear weigh 30 pounds; but the material is so flexible that the soldier wearing such an outfit can kneel, lie down, rise and run, charge from the trenches, use the bayonet, or throw hand grenades, without impediment to his movements. It has been denied that dum-dum bullets, placed under ban by all civilized nations, have been used by the Germans, but there is no doubt that explosive bullets have been used. The report of the Belgian Commission, which investigated the horrors when the Germans first invaded King Albert's country, contains testimony which proves conclusively that such missiles were used. These bullets were, in effect, small shells containing an explosive chemical which was set off by contact. Photographs taken of wounds show the effect which these bullets produced. More than that, the Russians charged that along the northern frontier the Germans fired glass bullets, although there is nothing to sustain the belief that such missiles were generally used. The dum-dum bullet is a soft-nosed missile which, when it strikes a bone, flattens out and splatters, creating a jagged wound which it is almost impossible to treat or heal. The Germans, in ordinary, use a steel jacketed bullet which possesses high penetrative powers, while the French at the beginning of the war were using the ordinary lead bullet. AN AMERICAN BULLET.