THE investigation of the structure and gradual
growth of the ovarian egg is so laborious that
it will be many years before we can hope to
have a complete picture of all its phases. The
apparatus required for the task is very compli-
cated, and a long training is necessary merely
to prepare the student for the use of his instru-
ments. A superficial familiarity with the mi-
croscope gives no idea of the exhausting kind
of labor which the naturalist must undergo
who would make an intimate microscopic study
of these minute living spheres. The glance at
the moon, or at Jupiter's satellites, which the
chance visitor at an observatory is allowed to
take through the gigantic telescope, reveals to
him nothing of the intense concentrated watch-
ing by which the observer wins his higher re-
ward. The nightly vision of the astronomer,
revealing myriad worlds in the vague nebulous
spaces of heaven, is not for him; he must take
the great results of astronomy for granted, since

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