and deductions.

The work is divided into three parts, of which the first deals with the
development of the senses, the second with the development of the will,
and the third with the development of the understanding.

Beginning with the sense of sight, the observations show that light is
perceived within five minutes after birth, and that the pupils react
within the first hour. On the second day the eyes are closed upon the
approach of a flame; on the eleventh the child seemed to enjoy the
sensation of light; and on the twenty-third to appreciate the rose color
of a curtain by smiling at it. Definite proof of color discrimination
was first obtained in the eighty-fifth week, but may, of course, have
been present earlier. When seven hundred and seventy days old the child
could point to the colors yellow, red, green, and blue, upon these being
named.

The eyelids are first closed to protect the eyes from the sudden
approach of a threatening body in the seventh or eighth week, although,
as already observed, they will close against a strong light as early as
the second day. The explanation of their beginning to close against the
approach of a threatening body is supposed to be that an uncomfortable
sensation is produced by the sudden and unexpected appearance, which
causes the lids to close without the child having any idea of danger to
its eyes; and the effect is not produced earlier in life because the
eyes do not then see sufficiently well. On the twenty-fifth day the
child first definitely noticed its father's face; when he nodded or
spoke in a deep voice, the child blinked. This Professor Preyer calls a
"surprise-reflex;" but definite astonishment (at the rapid opening and
closing of a fan) was not observed till the seventh month. The gaze was