7. Q. How does its axial revolution compare with that of the earth? A. It is nearly the same.

8. Q. With what kind of a light does Mercury shine? A. With a white light nearly as bright as Sirius.

9. Q. In what part of the heavens is Mercury to be seen? A. It is always near the horizon.

10. Q. What is the distance of Venus from the sun, in round numbers? A. Sixty-six million miles.

11. Q. How does its diameter compare with that of the earth? A. It is nearly the same.

12. Q. How does its axial revolution compare with that of the earth? A. It is also nearly the same.

13. Q. What is said of the appearance of Venus in the heavens? A. It is the most beautiful object in the heavens, and is often visible in the day time.

14. Q. What is the mean distance of the earth from the sun? A. Ninety-two million five hundred thousand miles.

15. Q. What is the polar and what the equatorial diameter of the earth? A. The polar, 7,899 miles; the equatorial, 7,925-1/2 miles.

16. Q. State three facts in regard to the aurora borealis. A. It prevails mostly near the arctic circle rather than the pole; it is either the cause or the result of electric disturbance; it is often from four to six hundred miles above the earth, while our air can not extend over one hundred miles above the earth.