progressed far enough in its evolution to produce them. I expect

to find it in its Palaeozoic or Mesozoic period, while over a

hundred years ago the English astronomer, Chambers, thought that

on Saturn there was good reason for suspecting the presence of

"What sort of spaceship do you propose to have?" asked the

"As you have to pass through but little air," said Deepwaters, "I

should suggest a short-stroke cylinder of large diameter, with a

flat base and dome roof, composed of aluminum, or, still better,