which both lads took hold of the problem and even suggested certain
really desirable changes.

Bill indicated a better position fifty yards upstream for the dam and he
sketched his idea of making a water-tight flood gate which was so
ingenious that the Professor became enthusiastic and adopted it at once.

After nearly a whole day spent thus along the rocky defiles of the
little stream, eating their lunch beside a cold spring at the head of a
miniature gulch, the trio of engineers were about to leave the spot when
a gruff voice hailed them from the hilltop. Looking up they saw another
group of three: an oldish man, a slim young fellow who was almost a
grown man and a girl in her middle teens. The young people seemed to be
quarreling, to judge from the black looks they gave each other, but the
man paid them no attention. He beckoned Professor Gray to approach and
came slowly down the hill to meet him, walking rather stiffly with a
cane.

"Well, Professor, you're beginnin' to git at it, eh? Struck any snags
yit? Some job! I reckon you're not a goin' to make a heap outside the
price you give me. When you goin' to git at it reg'lar?"

"Right away, Mr. Hooper. To-morrow. We have been making our plans to-day
and these young assistants of mine, who will principally conduct the
work, are ready to start in at once. They--"

"Them boys? No, sir! I want this here work done an' done right; no
bunglin'. What's kids know about puttin' in water wheels an' 'letric
lights? You said you was--"