This has been done with a purpose. The pupil should learn how to go
outside of the book and gather from scattered sources information
concerning questions that the book suggests. In other words, he should
begin to learn _how to make researches_, for that is coming to be
one of the useful arts, not merely for scholars, but for men and
women in many sorts of avocations. It is always useful, as well as
ennobling, to be able to trace knowledge to its sources. Work of this
sort involves more or less conference and discussion among classmates,
and calls for active aid from the teacher; and if the teacher does not
at first feel at home in these methods, practice will nevertheless
bring familiarity, and will prove most wholesome training. For the aid
of teachers and pupils, as well as of the general reader who wishes to
pursue the subject, I have added a bibliographical note at the end of
each chapter, immediately after Mr. Hill's "Suggestive Questions and
Directions."
This particular purpose in my book must be carefully borne in mind.
It explains the omission of many details which some text-books on the
same subject would be sure to include.
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