My wife is averse to widowhood. Lately she exacted my solemn pledge not to assist Hawkins with any more of his diabolical inventions.

For a similar reason, his own good lady drew me aside a few evenings since, and insisted upon my promising to use every means, physical force included, which might prevent her “Herbert” from experimenting further with his motor.

Hawkins hadn't favored me with any confidences about the motor, and at the first opportunity I indicated with brutal directness that none was desired.

Hawkins inquired with frigid asperity as to my meaning; but the very iciness of his manner satisfied me that he understood perfectly, and, believing that he was sufficiently offended to keep entirely to himself all details of his machine—whatever it might be—I breathed more easily.

Some of these days one of Hawkins' inventions is going to take him on a personally conducted tour to a quiet little grave, and I have no wish to learn the itinerary beforehand.

Now, bitter experience has taught me that eternal vigilance is the price of freedom from complicity with the mechanical contrivances of Hawkins, and I should have been suspicious. Yet when Hawkins appeared Sunday morning and asked me to go for a little jaunt up the Hudson in his launch, I accepted with guileless good faith.

His launch was—perhaps it is still—the neatest of neat little pleasure boats, and when we left the house I anticipated several hours of keen enjoyment.

Crossing Riverside Drive, it struck me that Hawkins was hurrying, but the balmy air, the sunshine, and the beautiful sweep of the river filled my mind with infinite peace, and it was not until we had descended to the little dock that I smelled anything suggestive of rat.

Hawkins climbed into the launch, and I smiled benignly on him as I handed down the lunch and our overcoats. I had just finished passing them over when I stopped smiling so suddenly that it jarred my facial muscles.

“Where has the engine gone?” I demanded.