"They are much livelier than our moon," replied Mary; "and the second moon flies right around Jupiter in a little more than a day and a half, and even the outside moon only takes about two weeks; so there must always be a moon shining in the sky for Jupiter. These moons, except the moon discovered by Professor Barnard, are all larger than our moon, and the fourth one is nearly as large as Mars. But I hear the bell for lunch, Harry, and I must run away now. I will tell you about the other planets later."
"How many are there?" said Harry, as his sister kissed him good-by.
"Only three," replied Mary; "and I shall tell you about them to-morrow, if you are not too tired."
"Too tired!" said Harry. "I am never too tired to listen to you."
JUPITER.
Oh! that it were my doom to be
The spirit of yon beauteous star,
Dwelling up there in purity,
Alone, as all such bright things are;
My sole employ to pray and shine,