Vapour, Low Temperature.

irs surrounding 1st Class Star, Sirius. ours surrounding 2nd Class Star, the

apours surrounding 3rd Class Star, sphere.

Absorption.

Radiation.

ELEMENTARY LESSONS

IN

ASTRONOMY.

BY

J. NORMAN LOCKYER, F.R.S.

CORRESPONDENT OF THE INSTITUTE OF FRANCE, ETC. ETC.

London:

MACMILLAN AND CO.