The heavy snow may have kept them from coming much nearer to us than they are now." "What makes you think so ?" Shepard smiled.
"We heard sounds, odd sounds," he replied.
"Were they made by a whistle ?" Dick asked eagerly.

Shepard smiled again.
"It was natural for you to ask that question, Mr.Mason," he replied, "but it was not a whistle.

It was a deeper note, and it carried much farther, many times farther.

Mr.Reed explained it to me.

Somebody with powerful lungs was blowing on a cow's horn." "I've heard 'em.