according to the information furnished by the United States
Geological Survey, it is evident that the known supplies of our
high-grade phosphate will be practically exhausted in fifty years if
our exportation continues to increase at the prevailing rate. After
that is gone we may then draw upon our low-grade phosphate deposits,
which though probably not inexhaustible are known to be exceedingly
extensive."






CHAPTER XXXI

THEORIES VERSUS FACTS





PERCY planned to walk to Blue Mound to take the three-thirty train
that Saturday afternoon; but Adelaide's parents both insisted that
she would willingly drive to the station, and the grandmother
discovered that she needed a certain kind of thread which Adelaide
could then also get at the store.

"Certainly," said Adelaide, with some merriment, "I always enjoy our
departing guests to the train."