A remarkable proof of the harmlcssness
of useing glasses, even a Bingle glass, is
furnished by watch makers, who appear to
enjoy an enviable immunity from eye dis
eases. It is uncommon to see a watch
maker in a ophthalmic hospital. The
habitual exercise ot the eye upon fine work
tends to the development and preservation
of its powers. This is in analogy to the
truth now getting currency that brain-work
is necessary to physical health. The man
who would preserve the full integrity of his
functions to a ripe o'.d age must avoid ex
cesses of every description, aud endeavor
to employ the higher faculties of his mind
somewhat more energetically than is now
always customary. A time comes to every
one when the physical powers begin to de
cay, and then, unless the brain has been
kept active and recipient by exercise, there
is nothing left to live, aud the' man per
ishes. We say that he died of gout, . of
overeating, or ot heart disease, or of kidney
disease, or of the failure of the particular
organ which was tbe first to exhibit symp
toms of the approaching end. In reality
he has died ot stupidity, artificially pro
duced by neglect of the talents with which
he was endowed. Tl'-.t which is true of
the organism as a whole is tnie also of its
parts; and the eyes, anion; others, are best
treated by an amount ot systematic us1
which preserves the tone of their muscles
and the regularity of eir biood supplv.
