It stands out-doors from 7 A.M.to 9 P.M.
The girls are encouraged to use it: they are expected to determine the rotation of the sun on its axis by watching the spots--the same for the planet Jupiter; they determine the revolution of Titan by watching its motions, the retrograde and direct motion of the planets among the stars, the position of the sun with reference to its setting in winter and summer, the phases of Venus.

All their book learning in astronomy should be mathematical.

The astronomy which is not mathematical is what is so ludicrously called "Geography of the Heavens"-- is not astronomy at all.
My senior class, generally small, say six, is received as a class, but in practical astronomy each girl is taught separately.

I believe in _small_ classes.

I instruct them separately, first in the use of the meridian instrument, and next in that of the equatorial.