The poor little fellow stood between us looking the picture of innocence combined with oppression, which his countenance fully developed, but said not a word.

Under the said table there happened to be a ball left by a younger child.

I took it up and kindly asked the man the shape of it?
he instantly replied, "_Round_." "Then," said I, "is that table the same shape as the ball ?" The man thought for a minute, and then said, "It is _round-flat_." I then explained the difference to him between the one and the other, more accurately, of course, than the infant could; and told him, as he himself saw a distinction, it was evident they were not both alike, and told him that the table was circular.
"Ah!" said be, "that is just what the little one said! but I did not understand what circular meant; but now I see he is right." The little fellow was so pleased, that he ran to his father directly with delight.

The other could not resist the parental impulse, but seized the boy and kissed him heartily.
The idea of _size_ is necessary to a correct apprehension of objects.
To talk of yards, feet, or inches, to a child, unless they are shown, is just as intelligible as miles, leagues, or degrees.

Let there then be two five-feet rods, a black foot and a white foot alternately, the bottom foot marked in inches, and let there be a horizontal piece to slide up and down to make various heights.