s in the ether to give purchase to the
explosions of their water-motor." Does the author mean to
say that the explosions of the tubes have to have something
to push against to have any action? (a) Has it not been
proven actually and mathematically that the explosions of
rockets and expanding gases are even more powerful in space?
The space ship in this story was equipped with both bow and
stern tubes; why not fire them to slow the ship down instead
of waiting to run into some resistance?

(b) Also, when they landed they took some air-guns which
shot bullets containing a liquid which exploded when heated
by the passage of the shell through the barrel; then the
author goes ahead and tells us that the planet was about as
hot as the tropics. Such heat should explode the bullets,
but it didn't. Why?

Mr. Ernst has his heroes do a lot of running around on that
little planet.

(c) Since the planet is smaller than the moon, it hasn't
much gravity and therefore can't retain a very heavy
atmosphere, or one very thick. Anyone doing all that violent
exercise would probably die of exhaustion before many
minutes of it.

"Four Miles Within" was a good story, but I am unable to
understand why they did not find a lot of stagnant air. Air
that had lain stagnant for the time that cavern must have
been closed would have killed the person who breathed it.
Also, I would imagine that it wouldn't be safe to handle a
chunk of radium like the characters in the story did; it's
liable to burn. However, it probably wasn't pure radium,
just pitchblende-bearing rocks.

The rest of the stories were fine. I especially like the
stories of the Special Patrol Service which S. P. Wright has
created. Let's have some more stories of Commander John
Hanson and his crew.

"The Exile of Time" has started off quite well and I look
forward to the next installments. Cummings is always good
for a batch of thrills and some swell adventure, to say
nothing of the enjoyable way he introduces science into the
story.

Wish you would publish this, as I would like to get in touch
with some other Science-Fiction fans.

By the way, some of the readers seem to want the mag
changed, but don't you do a thing to it. All the
suggestions, if followed, would