"You came just as I was about to try an experiment on the highest form of life I've yet exposed to my new rays," he said, striding toward the savage hound.

The gathering mist rapidly occluded the dog, until the creature was concealed completely by the rolling vapor. But just before it disappeared, Jim saw that the fog seemed not to be gathering from the air penned up in the bell, but in some strange and rather awful way to be exuding from the body of the dog itself!

At first, when the misty vapor cleared, there was no dog to be seen. Until Matt looked closely at the floor of the bell-space, and saw the canine reduced to the size of an insect. . . .