"Not What is it then?" asked the western ranch lad.

"It's a stethoscope," declared Nort.

"Whew! x I didn't know Yellin' Kid could play one of
_them_!" exclaimed Bud. "He must be more musical than any of
us thought!"

"'Tisn't musical, I tell you!" cried Nort, half laughing. "This
is a _stethoscope_--it's what a doctor listens to your lungs
or heart with when you're sick."

"He never listened to mine!" boasted Bud, "at least not since I
can remember, for I've never been sick."

"Well, I have," admitted Nort, "and so has Dick. You remember Dr.
Thompson using one of these, don't you?" he asked his stout
brother.

"Sure I do! And there's some other name for it besides plain
stethoscope," declared Dick. "It's a long word--bi--di--"

"Binaural stethoscope! That's it!" broke in Nort. "I remember,
now. I thought I'd never be able to say those words, but they
come back to me now. Binaural stethoscope."

"'Tisn't good to eat, or shoot with, is it!" asked Bud, as he
again took the instrument and turned it over and over in his
hands.