ompleted his task, while Andy Sudds announced one morning that his department was ready for

ry from the boy who had brought the message, developed the fact that Dick did not know the man, nor had he ever seen him before

y, while he and his chum, with the two professors, were workin

h will replace the ones used on the Etherium motor. Then I want to test them, and, if I find that th

and on the side turned away from us?" asked

at?" asked Jack. "Doesn

make a revolution about our planet. So that, in the long run, to quote from my astronomy, it keeps the same side always toward the earth; and today, or, to be more correct, each night that the mo

n the other side of t

ch it. Perhaps there are people there, and air and water, for it is practicall

go," said Jack, with a shiver. "W

rofessor Henderson, with a smile. "Then, too, we will take plenty with us, and, of course, t

hey must have a quee

k, who wasn't ve

th's-and, comparing the force of gravity, ours is much greater. A body that weighs six pounds on the earth, would weigh only one

ng into the projectile. "What was yo' pleased t' saggasiate, in remarkin' concernin' de untr

t did I say?" as

sked yo'," spoke the

you meant to," went on the yout

r not go on dish yeah trip af

manded Profes

as yo' does when yo' is on dis yeah earth. An' s'posin' some ob dem moon men takes a notion t' throw a

," said Mark quickly. "It is only a theor

ry; eh?" asked W

t's

colored man. "I didn't know it were a theory. Dat makes it all right. I

t's

I-I used t' eat 'em boiled an' roasted befo' de wah." And, with a contented smile on his fa

fessor and the boys were working over it there, carefully guarded from curious eyes,

ade. The boys were of great assistance, for they were p

Cardite motor to-morr

fter a hard day's wo

will work?" ask

My experiments hav

ork, when can we

ything else is in readiness, the

owed away," said Andy Sudds,

um one? Would it send them along through space at enormous speed? True, they would not have to travel so far, nor so fast, but more power would be needed, since, as i

d to a machine in the projectile used for winding a cable around a windlass when the

cured from Mars. Then he closed the heavy metal box that held it, and, looking about to see if all was in r

would be impossible in a motor of this size, if operated by electricity, gasoline, or any other force at present in us

Mark and the others watched him carefully. They were sta

uzzing hum, as the motor began to absorb the great power from the red substance, whic

ving!" cr

a bursting bomb, and everyone was knocked from his feet, over backward,

ploded!" cried Mark. "Pro