ome to cheer them, and also a
communication from Professor Snodgrass.

The little scientist said he had tried in vain to get some trace of
the two missing girls, and expressed the hope of seeing the boys soon,
to get the benefit of any advice they could give him. He also stated
that he was progressing well with his scientific work of noting the
effect of terrific noises on insects. But, somehow or other, the Motor
Boys did not take as much interest in the pursuit of the scientist as
they had formerly.

"The war has changed everything," declared Jerry.

"But, of course, we'll help him find the girls if we can," suggested
Ned.

"Oh, of course," agreed his tall chum.

Their stay in the rest camp was made pleasant by the ministrations of
the Y. M. C. A. and the Knights of Columbus representatives. The chums
and their comrades spent much time in the different huts, where they
were entertained and could get hot chocolate, candy or chewing
gum--rations not then issued by the army commissary.

"If it wasn't for these organizations war would be a whole lot worse
than it is," declared Jerry, as they came from a Y. M. C. A. meeting
and moving-picture show one evening.

"And don't forget the Salvation Army!" chimed in Bob. "The fried holes
those lassies turn out are the best I ever ate--not excepting those
mother used to make."

"Yes, those doughnuts fill a big void, even if they have a hole in the
middle," agreed Ned.

But all good things--even Salvation Army doughnuts--come to an end
some time, and so did the rest period of the three friends. Back to
the trenches they went, to find out that what Ned had predicted was
about to happen. An attack of considerable magnitude was in
preparation, and it was to be as much of a surprise to the Germans as
possible.

"It's going to be over the top all right," declared Jerry, when, one
evening, they received their final instructions. The attack, preceded
by a brief artillery preparation, was to take place at dawn, the "zero
hour" selected.

It was believed, and was proved true as after events showed, that by
considerably shortening the artillery fire, the Germans would be
unprepared. They were used to the big guns bombarding them for a day
or more at a stretch before the infantry came over. This was to be a
change.

The night before the attack was a nervous one. Yet those not on duty
managed to get some sleep. For many it would be their last.

Then came the general awakenin