understanding of the facts.

=Defects of Hearing.= Hearing defects are only about half as frequent as
those of sight. They are nearly all due to catarrhal infection of the
middle ear through the Eustachian tube. The careful and frequent
medical examination of school children cannot, therefore, be too
strongly emphasized. The deafness or partial deafness that comes from
this catarrhal infection can seldom be cured; it must be prevented by
the early treatment of the troubles which cause it.

SUMMARY. The mind is closely related to the body. Especially is it
dependent upon the brain, nerves, and sense organs. The sense organs
are special adaptations of the nerve-ends for receiving impressions.
Each sense organ receives only its particular type of impression.

The main visual phenomena are those of color-mixture, after-images,
adaptation, and contrast. Since sensation is the basis of mental
life, defects of the sense organs are serious handicaps and should
be corrected if possible. Visual defects are usually due to a
misshapen eyeball and can be corrected by proper glasses, which
should be fitted by an oculist. Hearing defects usually arise from
catarrhal trouble in the middle ear.


CLASS EXERCISES

1. Make a study of the relation of the mind to the body. Enumerate the
different lines of evidence which you may find indicating their close
relationship.