is teeth, and made a regular play of gnashing the teeth. When
on the four hundred and ninth day he stood up straight in bed, holding
on to the railing of it with his hands, _he bit himself on his bare
arm_, and that the upper arm, so that he immediately cried out with
pain. The marks of the incisors were to be seen long afterward. The
child did not a second time bite himself in the arm, but only bit his
fingers, and inadvertently his tongue.

The same child, who likes to hold a biscuit to the mouth of any member
of the family to whom he is favorably disposed, offered the biscuit in
the same way, entirely of his own accord, to his own foot--sitting on
the floor, holding the biscuit in a waiting attitude to his toes--and
this strange freak was repeated many times in the twenty-third month.
The child amused himself with it.

Thus, at a time when the attention to what is around is already very far
developed, one's own person may not be distinguished from the
environment. Vierordt thinks that a discrimination between the general
feelings [i. e., those caused by bodily states] and the sensations that
pertain to the external world exists in the third month. From my
observations I can not agree with him; for, although the division may
begin thus early, yet it does not become complete until much later. In
the ninth month the feet are still eagerly felt of by the little hands,
though not so eagerly as before, and the toes are carried to the mouth
like a new plaything. Nay, even in the nineteenth month it is not yet
clear how much belongs to one's own body. The child had lost a shoe. I
said, "Give the shoe." He stooped, seized it, and gave it to me. Then,
when I said to the child, as he was standing upright on the floor, "Give
the foot," in the expectation that he would hold it out, stretch it
toward me, he grasped at it with both hands, and labored hard to get it
and hand it to me.

How little he understands, even after the first year of his life has
passed, the difference between the parts of his own body and foreign
objects is shown also in some strange experiments that the child
conducted quite independently. He sits by me at the table and
strikes very often and rapidly with his hands successive blows upon
the table, at first gently, then hard; then, with the right hand
alone, hard; next, suddenly strikes himself with the same hand on
the mouth; then he holds his hand to his mouth for a while, strikes
the table again with t