the four wheels of a waggon,
and the three others of the horses, therefore they have called them by
this name. Now, Tommy, look well at these, and see if you can find any
seven stars in the whole sky that resemble them in their position."

_Tommy._--Indeed, sir, I do not think I can.

_Mr Barlow._--Do you not think, then, that you can find them again?

_Tommy._--I will try, sir. Now, I will take my eye off, and look another
way. I protest I cannot find them again. Oh! I believe, there they are.
Pray, sir (pointing with his finger), is not that Charles' Wain?

_Mr Barlow._--You are right; and, by remembering these stars, you may
very easily observe those which are next to them, and learn their names
too, till you are acquainted with the whole face of the heavens.

_Tommy._--That is indeed very clever and very surprising. I will show my
mother Charles' Wain the first time I go home; I daresay she has never
observed it.

_Mr Barlow._--But look on the two stars which compose the hinder wheel
of the waggon, and raise your eye up towards the top of the sky; do you
not see a very bright star, that seems to be almost, but not quite, in a
line with the two others?

_Tommy._--Yes, sir; I see it plainly.

_Mr Barlow._--That is called the Pole-star; it never moves from its
place, and by looking full at it, you may always find the north.

_Tommy._--Then if I turn my face towards that star, I always look to the
north.

_Mr Barlow._--You are right.

_Tommy._--Then I shall turn my back to the south.

_Mr Barlow._--You are right again; and now cannot you find the east and
the west?

_Tommy._--Is it not the east where the sun rises?

_Mr Barlow._--Yes; but there is no sun to direct you now.

_Tommy._--Then, sir, I cannot find it out.

_Mr Barlow._--Do not you know, Harry?

_Harry._--I believe, sir, that if you turn your face to the north, the
east will be on the right hand, and the west on the left.

_Mr Barlow._--Perfectly right.

_Tommy._--That is very clever indeed; so then, by knowing the Pole-star,
I can always find north, east, west, and south. But you said that the
Pole-star never moves; do the other stars, then, move out of their
places?

_Mr Barlow._--That is a question you may learn to answer yourself, by
observing the present appearance of the heavens, and then examining
whether the stars change their places at any future time.

_Tommy._--But, sir, I have thought that it would be a good contrivance,