Still holding the cylinder in his hand, Phor Tak stepped to a shallow cabinet against the wall and opening it revealed an elaborate equipment of switches, levers and push buttons. "Now watch the miniature flier suspended from the track near the ceiling," he directed, at the same time closing a switch. Immediately the flier commenced to travel along the track at considerable speed. Now Phor Tak pressed a button upon the top of the cylinder, which immediately sped from his extended palm, turned quickly in the air and rushed straight for the speeding flier. Slowly the distance between the two closed; the cylinder, curving gradually into the line of flight of the flier, was now trailing directly behind it, its pointed nose but a few feet from the stern of the miniature ship. Then Phor Tak pulled a tiny lever upon his switchboard and the flier leaped forward at accelerated speed. Instantly the speed of the cylinder increased and I could see that it was gaining in velocity much more rapidly than the flier. Half way around the room again its nose struck the stern of the fleeing craft with sufficient severity to cause the ship to tremble from stem to stern; then the cylinder fell away and floated gently toward the floor. Phor Tak opened a switch that stopped the flier in its flight and then, running forward, caught the descending cylinder in his hand. "This model," he explained, as he returned to where we stood, "is so constructed that when it makes contact with the flier it will float gently downward to the floor, but as you have doubtless fully realized ere this, the finished product in practical use will explode upon contact with the ship. Note these tiny buttons with which it is covered. When any one of these comes in contact with an object the model stops and descends, whereas the full sized device, properly equipped, will explode, absolutely demolishing whatever it may have come in contact with. As you are aware every substance in the universe has its own fixed vibratory rate. This mechanism can be so attuned as to be attracted by the vibratory rate of any substance. The model, for example, is attracted by the blue protective paint with which the flier is covered. Imagine a fleet of Jaharian warships moving majestically through the air in battle formation. From an enemy ship or from the ground and at a distance so far as to be unobservable by the ships of Jahar, I release as many of these devices as there are ships in the fleet, allowing a few moments to elapse between launchings. The first torpedo rushes toward the fleet and destroys the nearest ship. All the torpedoes in the rear, strung out in line, are attracted by the combined masses of all the blue protecting coverings of the entire fleet. The first ship is falling to the ground and though all of its paint may not have been destroyed, it has not the power to deflect any of the succeeding torpedoes, which one by one destroy the nearest of