ob with a sigh of satisfaction, as he

aven't that worn and hungry appearance you had a while ag

ean?" demanded the st

continually be talking

oo," went on Bob. "I notice

naturedly. "I guess we were all hungry. It was th

they've got the busted dam mended-maybe there's a lot of men drowned-maybe we can see where Noddy

" answered Ned, a bit soberly. "

the dam," and taking Ned's words as a sort of gentle hint, the excitabl

d Jerry, as he watched Andy hurrying away. "He might talk so much that he'd put anoth

ed promptly. "You fellows don't mean to say

"do you intend to

d Jerry are, and if the profe

a scientific book he had started to read as soon

an get it, but I don't know that it's possible, after what you hav

boat, as the other scientists did. It is almost certain death. I really don't know how one could make the descent into the canyon. The island, as I understand

re several trails that could be used, Bright Angel Trail is one, and then there are Bass's, Boucher's, Berry's and the Red Canyon Trail. Berry's is n

ter with our airship

and get that radium! It will be just the thing! Here it is almost vacation time, school will close in

oaned it to Mr. Glassford to give an exhibition at the international aer

asked Ned, who seemed unusually

will soon be sending our motorsh

ions," broke in Bob. "What's the matter

use it?" inquired the

we could have a fine time going West in it. Say, things couldn't happen

had again become absorbed in his book, and had paid no a

ined Ned. "Trying to get Jerry enth

's son. "Only it doesn't sound feasible. Our airship

or boat," broke in N

erry. "Say, you fellows

of yours then,

my noti

essor Snodgrass, leaping from his chair, and h

a blue-nosed grasshopper?" for the scientist was continual

f the horned toad, but very different. For years I have been investigating, trying to get on the trail of this sort of toad, and now, most unexpectedly, I come upon a clew. Boys, this has indeed been a fo

from the article in the book. The boy

at least it won't be much out of our way to go there. We can have a try for the radium f

d. But I think that will be a good plan. I was undecided about it before, but, since yo

o-tailed toad," added Bob.

uto and motorship. First we'll write to Mr. Glassford, asking him to hold

first helped our heroes to construct their motorship. He had recen

tain pen and write some letters. It's decided then; we'll have a

man," spoke Bob. "I'

One was for Ned Slade. He quickly tore it op

tter-bad news?

he discovered a flaw in the back axle, and, in order to have a new one properly fitted in he sent the c

the trip west!" exclaimed Jerry.

Bob eagerly. "Fello