LONDON: PRINTED BY

SPOTTISWOODE AND CO., NEW-STREET SQUARE AND PARLIAMENT STREET

LEISURE HOURS.

A SERIES OF FAMILIAR ESSAYS

ON

SCIENTIFIC SUBJECTS, NATURAL PHENOMENA, &c. &c.

nothony

BY

RICHARD A. PROCTOR, B.A. CAMB., F.R.A.S.

AUTHOR OF

'THE SUN'OTHER WORLDS THAN OURS SATURN' ETC.

'I bear you witness as ye bear to me,

Time, day, night, sun, stars, life, death, air, sea, earth.'

SWINBURNE.

LONDON:

LONGMANS, GREEN, AND CO.

1871.

RAH