slender beam thrown out across the veranda comforted me immensely; but I still stood against the post, trying vainly to think out what Sam had said.

The breeze grew cooler. In ten minutes a thin cold wind sprang up from the north. I drew my light garments close about my body and shivered a little. For a while I did not go in. Presently I felt a cold mist on the wind. Suddenly a snowflake splashed chillingly against my face—an omen of the frigid doom that lay before the earth! I got up and stepped inside the door, to escape the icy wind. In a few minutes it began to rain, because, of course, of the chilling of the air and condensation of the moisture.

Suddenly curious about how the world was taking the weird catastrophe, and about what was happening elsewhere, I went to the radiophone in the living room, and switched it on. Not a sound came from it! Not even a hint of static! The ether was utterly dead! That meant that the strange force had already cut our civilization up into a thousand helplessly isolated units!

Then from the rear of the building I heard the peculiar rhythmic throbbing beat of a hydrodyne power generator. Sam was already at work in the little room he had always kept locked, even against me. I walked back to the door and knocked, asking to be allowed to come in.

Sam called out for me to enter, and I stepped inside. I stopped at the door in amazement. The little space was crowded with intricate electrical apparatus of modern design—in fact, much of it was new and unfamiliar to me. There were intra-atomic power generators, huge electron tubes, coils, switches, loop antennæ, and a wealth of other material that was strange to me. I saw at once that the laboratory before me must have represented vast sums of money and years of toil.

Sam, clad in a pair of greasy overalls, with a great smudge of grease already over half his lean face, was working intently over a huge complex device in the center of the room. Evidently it had been recently and hastily assembled from the materials at hand, and was not yet quite finished. In fact, a desk by the wall was still littered with the plans and calculations from which it had been set up.

It was evidently founded on an adaptation of Sam's great invention of forty years before, the hydrodyne sub-atomic engine. The hydrodyne is based in principle on the catacytic disruption, by means of a radioactive salt, of water, the products being hydrogen and oxygen gases, which are burned in the cylinders, the steam formed being 

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