are brought into contact or even overlap, materially reducing the
size of the head. Within a few hours after birth the bones again
spread apart, and some months elapse before they begin to unite; the
union is not completed until some time during the second year of
infancy.

Many mothers are anxious to know how far the senses of the infant
have developed when it enters the world. This problem has stimulated
some scientific investigation, though hardly so much as its interest
would justify. Two lines of inquiry have been pursued toward its
solution. The objective point of one of these has been to determine
how nearly the sense organs of the newborn correspond anatomically to
those of an adult; that is how perfectly has their organization been
completed. The other has been to learn how the infant reacts when the
various senses are stimulated; the interpretation of these reactions
is, however, particularly liable to error and sometimes amounts only
to guesswork.

The organization of the nerves and muscles in the eye is far from
perfect at the time of birth. The muscles act irregularly; indeed,
the lack of muscular adjustment is such that movements of the eye
likely to alarm the parents are regularly observed in very young
infants. Furthermore they cannot focus images which fall upon their
eyes. The retina, which receives visual impressions, has reached such
development at birth, however, that sensations of light can be
perceived. For example, if a lamp is suddenly flashed before the face
of a newly born baby it cries. From this and similar evidence,
indicating that strong light irritates the delicate structures of the
eye, we have learned that a nursery should not be illuminated, during
the day or night, so brightly as the rooms adults occupy. Certainly