The fence itself was all of seven feet high and made of the heaviest of woven-wire construction. It was topped with barbed wire, and went all the way down both sides of a narrow right of way until it vanished in the distance. Tommy got out of the car and opened the gate. This fitted the description of his destination, as given him by a brawny, red-headed filling-station attendant in the village some two miles back. He drove the roadster through the gate, got out and closed it piously, got back in the car and shot it ahead. He went humming down the narrow private road at forty-five miles an hour. That was Tommy Reames' way. He looked totally unlike the conventional description of a scientist of any sort--as much unlike a scientist as his sport roadster looked unlike a scientist's customary means of transit--and ordinarily he acted quite unlike one. As a matter of fact, most of the people Tommy associated with had no faintest inkling of his taste for science as an avocation. There was Peter Dalzell, for instance, who would have held up his hands in holy horror at the idea of Tommy Reames being the author of that article. "On the Mass and Inertia of the Tesseract," which in the _Philosophical Journal_ had caused a controversy. And there was one Mildred Holmes--of no importance in the matter of the Fifth-Dimension Catapult--who would have lifted beautifully arched eyebrows in bored unbelief if anybody had suggested that Tommy Reames was that Thomas Reames whose "Additions to Herglotz's Mechanics of Continua" produced such diversities of opinion in scientific circles. She intended to make Tommy propose to her some day, and thought she knew all about him. And everybody, everywhere, would have been incredulous of his present errand. * * * * * Gliding down the narrow, fenced-in road. Tommy was a trifle dubious about this errand himself. A yellow telegraph-form in his pocket read rather like a hoax, but was just plausible enough to have brought him away from a rather important tennis match. The telegram read: PROFESSOR DENHAM IN EXTREME DANGER THROUGH EXPERIMENT BASED ON YOUR ARTICLE ON DOMINANT COORDINATES YOU ALONE CAN HELP HIM IN THE NAME OF HUMANITY COME AT ONCE. A. VON HOLTZ. The fence went on past the car. A mile, a mile and a half of narrow lane, fenced in and made as nearly intruder-proof as possible. "Wonder what I'd do," said Tommy Reames, "if another car came along from the other end?"