on the floor. Then, with a flick of its tail, it flew into the air and hit the ceiling of the room.

"Good Lord!" Danner said. Old years of work were at an end. New years of excitement lay ahead. He snatched the creature and it wriggled from his grasp. He caught it again. His fist was not sufficiently strong to hold it. He left it, flopping in eight-foot leaps, and went to class with considerable suppressed agitation and some reluctance. The determinant was known. He had made a living creature abnormally strong.

When he reached his house and unlocked the door of the laboratory, he found that four tadpoles, in all, had hatched. Before they expired in the unfamiliar element of air, they had demolished a quantity of apparatus.

Mrs. Danner knocked on the door. "What's been going on in there?"

"Nothing," her husband answered.

"Nothing! It sounded like nothing! What have you got there? A cat?"

"No—yes."

"Well—I won't have such goings on, and that's all there is to it."

Danner collected the débris. He buried the tadpoles. One was dissected first. Then he wrote for a long time in his notebook. After that he went out and, with some difficulty, secured a pregnant cat. A week later he chloroformed the tabby and inoculated her. Then he waited. He had been patient for a long time. It was difficult to be patient now.

When the kittens were born into this dark and dreary world, Mr. Danner assisted as sole obstetrician. In their first hours nothing marked them as unique. The professor selected one and drowned the remainder. He remembered the tadpoles and made a simple calculation.

When the kitten was two weeks old and its eyes opened, it was dieting on all its mother's milk and more besides. The professor considered that fact significant. Then one day it committed matricide.

Probably the playful blow of its front paw was intended in the best spirit. Certainly the old tabby, receiving it, was not prepared for such violence from its offspring. Danner gasped. The kitten had unseamed its mother in a swift and horrid manner. He put the cat out of its misery and tended the kitten with trepidation. It 

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