dragon but they were bitten off before they could grasp their prey.
"Let's get away from here, Jim," I cried, but I spoke too late. Even as the words left my mouth the green dragon saw us and raised itself in the air, and with gaping jaws launched itself at us. It took Jim only a moment to shoot, the flyer up into space, and the charge passed harmlessly beneath us. The dragon checked its headway and turned again toward us.
"Use the machine-gun, Pete!" cried Jim. "I've got to run the ahip."
I threw the cover off the gun and fed in a fresh belt of ammunition. As the green monster dashed toward us I hastily aligned the gun and pulled the trigger. My aim was good and at least fifty of the bullets plowed through the approaching bulk before Jim dropped the ship and allowed it to pass above us. Again the dragon turned and charged, and again I met it with a hail of bullets. They had no apparent effect and Jim dropped the ship again and let the huge bulk shoot by above us. Twice more the dragon rushed but the last rush was less violent than had been the first three.
"The bullets are affecting him, Pete!" cried Jim as he shot the flyer upward. "Give him another dose!"
I hastily fed in another belt, but it was not needed. The dragon rushed the fifth time, but before it reached us its velocity fell off and it passed harmlessly below us and fell on a long curve to the plain below. It fell near the purple amoeba which it had battled and a long feeler shot out and grasped it. Straight into the purple mass it was drawn, and vanished into the huge bulk.
Jim started one of the stern motors. In a few seconds we were far from the scene.
"Have you any idea of which direction to go?" he asked. I shook my head.
"Have you a radio beacon?" I asked.
He withered me with a glance.
"We're beyond the heavlside layer," he reminded me.
For a moment I was stunned.
"We can't be very far from the hole," he said consolingly as he fumbled with the controls. "But before we try to find it, we had better disconnect one of the stern motors and rig it as a disintegrating ray so that we will have one bearing in each direction. We may meet more denizens of space who like our looks, and we haven't much ammunition left."
We landed on the plain and in an hour had a second disintegrating ray ready for action. Thus armed, we rose from the blue plain and started at random on our way. For ten minutes we went forward. Then Jim stopped the flyer and turned back. We had gone only a short distance when I called to him to stop.
"What is it?" he demanded as he brought the flyer to a standstill.
"There's another creature ahead of us," I replied. "A red one."
"Red?" he asked excitedly as he joined me. About a mile ahead of us a huge mass hung in the air. It resembled the amoeba which had attacked us, except that the newcomer was red. As we watched, it moved toward us. As it did so its color changed to purple.
"Hurrah!" cried Jim. "Don't you remember, Pete, that the one which captured us and took us out of the hole was red while in the hole and then turned purple? That thing just came out of the hole!"
"Then why can't we see the red beam?" I demanded.
"Because there's no air or anything to reflect it," he replied. "We can't see it until we are right in it."
I devoutly hoped that he was right as he headed the ship toward the waiting monster. As we approached the amoeba came rapidly to meet us and a long feeler shot out. As it did so there was a flash of intense light ahead of us as Jim turned loose the ray, and the feeler disappeared. Another and another met the same fate. Then Jim rotated the ship slightly and let out the full force of the ray toward the
