To Hastings Simpson unfolded his tale carefully, leaf by leaf, and interested amazingly that eminent young electrician. Hastings, though now married, the possessor of a baby with the reddest face in all Chicago, and perfectly happy, had himself undergone somewhat of an experience in obtaining the mother of that baby, and so sympathized with Simpson deeply. "We'll invent that keyhole or latch-key, or break something," was all he said. There were thenceforth meetings every evening between the two--meetings which were sometimes far extended into the night; and the outcome of it all was that one morning, just as the sunbeams came thrusting the white fog over blue Lake Michigan, Simpson sought his own room somewhat weary-eyed, but with a countenance which was simply beatific in expression. The invention had been perfected! What that invention was may as well be described here and now. The first object to be sought was, naturally, a keyhole which could not easily be missed. Of course, this is a non-scientific description of it, but it may convey a fair idea to the average reader. First, instead of the ordinary keyhole there was something exactly resembling the customary mouthpiece through which we whistle upstairs from the ground floor of a flat seeking to attract the people who rarely answer. The only difference between it and the ordinary mouthpiece was that it was set in so that it was even with the woodwork of the door, and did not project at all. This mouthpiece tapered all around inside, and terminated in a keyhole which was rubber-lined. On the other side of this keyhole was a hard surface, padded with rubber, but having just opposite the mouth of the keyhole a small orifice extending through to a metal surface. That metal surface was a section of one of the most powerful horseshoe magnets ever invented in the United States, and was to be imbedded in the woodwork of the door. It was a huge thing, reaching nearly across the door, and warranted to pull toward it anything magnetic of reasonable dimensions. The keyhole was all the design of Simpson, the electric part of the affair all the invention of Hastings. Combined, they made something beautiful and wonderful.