be obtained of the appearance of the
objects and countries illustrated. But they should
be visited with the constant remembrance that the
perpetual transition of light and darkness, the glare
of fire-works, and the intensity and concentrative-
ness of light is not unattended with danger. Head-
ing by side-light, or in any position which causes
more light to fall upon one eye than upon the other,
is likely to be injurious. Sitting in front of a win-
dow with a quarto book on the knees ; considerable
use of a telescope or microscope with-

Direction of light.
out frequent intermissions ; sitting with
the back directly to any open window, and permit-
ting a strong light to fall immediately upon the
book or paper ; holding a candle between the eye
and book, are all practices likely to debilitate
the eyesight. The light should fall — as before



160 THE ETE.
remarked — obliquely from above, over the left
shoulder.
When in the street, the student should protect the

eyes from a burning sun by a wide hat-brim. The

summer hat should be light and of a

Summer hat.
