THE

EXPANSE OF HEAVEN :

A SERIES OF ESSAYS

ON THE

WONDERS OF THE FIRMAMENT.

BY

R. A. PROCTOR, B. A.,

66

OTHER WORLDS THAN OURS," THE MOON," "LIGHT SCIENCE FOR LEISURE
HOURS," ETC.

"Let there be lights

High in th' expanse of heaven, to divide

The day from night."

NEW YORK:

D. APPLETON AND COMPANY,

549 AND 551 BROADWAY.

1874.