At last the time arrived when the great disk was wrapped in hundreds of bales of cotton, suspended on racks and loaded onto the great truck. Tom insisted upon riding with his precious creation. The rest of his party, including his father, Ned Newton, Mr. Damon, Professor Standish, Koku and Rad, traveled by train to the foot of the mountain. [Illustration: The Disk Was Loaded on the Truck] "Massa Tom gonna look about six scrillion miles froo space," confided Eradicate Sampson to Koku. The old Negro leaned heavily upon the massive arm of his huge companion. "He see wonderful things!" "He sure make big medicine!" declared the giant, for once agreeing with his old rival. He had only the vaguest idea about what his master was attempting. [Illustration: Koku and Rad Went Along] When the entire group assembled on top the mountain there was a sudden hush. The sun had set in a fiery glow that presaged a clear night, and now darkness overtook the expectant onlookers. At last Tom stepped to the giant telescope and adjusted it upon the planet Mars. He electrified the immense disk, which glowed, then could not be seen at all. Looking through the eyepiece, the young inventor stood as though transfixed. One minute! Two! [Illustration: Tom Stepped to the Telescope] "Tom! How does it work?" asked Ned finally, unable to restrain himself any longer. "Look for yourself!" cried Tom, turning from the instrument. His face wore an expression of awe. Ned quickly took his place. "Marvelous!" he exclaimed. Before his eyes were revealed a great city, nearly seventy-five million miles distant! Peculiar people surged along the avenues, weird aircraft thronged the upper atmosphere, and gigantic buildings and palaces dotted the place. All on far-distant Mars! [Illustration: He Saw a Gigantic City] As each one in Tom's party saw the wonderful sight, he in turn congratulated the youthful inventor in his own way. Ned grasped his chum's hand but could say nothing. Mr. Damon blessed the distant stars. Koku and Rad fell upon their knees. Into the eyes of Barton Swift came tears as he said: "Tom, my son, you have performed the greatest miracle of the Age!" [Illustration: "You Have Performed a Miracle!"] Read These INTERESTING BOOKS Too! Airplanes!--War!--Superscience! TOM SWIFT and His Giant Telescope MANDRAKE THE MAGICIAN and the Midnight Monster MEN WITH WINGS: Thrilling Story of Flyers TAILSPIN TOMMY and the Sky Bandits Captain Frank Hawks, Famous AIR ACE, and the League of Twelve PAT NELSON, Ace of Test Pilots MAC OF THE MARINES in War-Torn China BARNEY BAXTER in the Air With the Eagle Squadron BUCK ROGERS, 25th Century A.D., in the War With the Planet Venus FLASH GORDON in the Forest Kingdom of Mongo SKYROADS, with Clipper Williams of the Flying Legion DON WINSLOW of the Navy vs. the Scorpion Gang Read These THRILLING BOOKS Too! Cowboys!--Indians!--Horses! THE LONE RANGER and the Red Renegades (With Silver and Tonto)