of the bullet and the expelled shell told him the whole tale. That's how he knew the gun was an army Colt automatic—I believe he called it a U. S. Government Colt—and not the ordinary Colt automatic. The weight of the bullets of these two pistols is slightly different: the ordinary Colt bullet weighs 200 grains, whereas the army Colt bullet weighs 230 grains. Hagedorn, having a hypersensitive tactile sense, was able, I presume, to distinguish the diff'rence at once, though I didn't go into his physiological gifts with him,—my reticent nature, you understand. . . . However, he could tell it was a forty-five army Colt automatic bullet; and knowing this, he knew that the muzzle velocity was 809 feet, and that the striking energy was 329—which gives a six-inch penetration in white pine at a distance of twenty-five yards. . . . An amazin' creature, this Hagedorn. Imagine having one's head full of such entrancing information! The old mysteries of why a man should take up the bass-fiddle as a life work and where all the pins go, are babes' conundrums compared with the one of why a human being should devote his years to the idiosyncrasies of bullets."
"The subject is not exactly an enthralling one," said Markham wearily; "so, for the sake of argument, let us admit that you have now found the precise point of the gun's explosion. Where do we go from there?"
"While I hold the string on a straight line," directed Vance, "be good enough to measure the exact distance from the floor to the knot. Then my secret will be known."
