Chapter Xv.--the Big Book.

This chapter should be read by parents to the children, as many sentences need expansion and explanation. Hints are given of great things which lie beyond the child's horizon. Discoveries that have changed mankind are referred to.

Children's permanent interests are the keynotes of instruction and the infallible guides of the teacher. To continue and sustain their spontaneous observation and desire for investigation leads directly to the study of the best books, and lays the basis for a thorough and profound study of God's universe.