Randall sent their machine racing again toward one of the upward tunnels, and as the long mechanism began to climb smoothly up the darkness he heard Lanier agonizing beside him. "God, if we have only enough time to get to that matter-transmitter before the Martians start flashing to earth through it!" "But Milton?" Randall cried. "We don't know whether he's alive or dead! We can't leave him!" "We must!" said Lanier solemnly. "Our duty's to the earth now, man, to the world that we alone can save from the Martian invasion and conquest! At the hour of twelve Nelson will have the matter-receiver turned on and at that hour the Martian will start flashing to earth--unless we prevent!" Suddenly Randall grasped the knob in his hands more tightly as light showed above them. They had been climbing upward through the enlarged tunnel at their machine's highest speed, and now as the tunnel curved the light grew stronger. Suddenly they were emerging into the thin sunlight of the Martian day. In the crimson jungle about them were many Martians, milling excitedly to and fro, and other centipede-machines that were blasting their way down through tunnels to the worm world beneath. Randall and Lanier, breathless, crouched low in the transparent-windowed control room as they sent their mechanism racing through this scene of swarming activity. Both gasped as one of the centipede-machines clashed against their own in passing, its Martian driver turning to stare after them. But there came no alarm, and in a moment they had passed out of the swarm of Martians and machines and were heading through the jungle in the direction of the city. * * * * * Through the weird red vegetation their mechanism raced with them, Randall holding it at its highest speed, and in minutes they came out of the jungle and were racing over the clear space between it and the great canal. Beyond that canal loomed into the thin sunlight the clustering cones of the mighty Martian city, two towering above all the others--the cone of the Martian Master and the other cone in which was the matter-transmitter and receiver. It was toward the latter that Lanier pointed. "Head straight toward that cone, Randall--we've but minutes left!" They were racing now up over the great arch of the canal's metal bridge, and then scuttling smoothly off it and along the broad metal street through which they had fled in darkness hours before. In it Martians and centipede-machines were coming and going in great numbers, but none noticed the human forms of the two crouched low in their mechanism's control room.