52 AN ATTACK IN THE REAR. 



meal, walked along the bank of the stream, until he reached tha highest point, 

 when he paused and scrutinized the surrounding country. 



Dick and Bob watched him with no little interest. 



" He knows so much about the habits of wild animals," remarked Bob, " that he 

 can easily locate their dwelling-places." 



" I suspected he possessed some secret of tracing them, but I guess you are 

 right ah ! he has discovered something." 



The next moment Pongo broke into a loping trot, like that of an American 

 Indian, taking a course that led him farther up stream. 



His shoulders were seen regularly rising and falling, until the slope of the 

 ground shut him from sight. He had left his spear in camp, but he carried his 

 three boomerangs, the longer portions of which had been thrust in his clothing at 

 his waist, where they could be withdrawn the instant needed. 



