THE

YEAR-BOOK OF FACTS

IN

Science and the Arts,

FOR

1874.

EDITED BY

CHARLES W. VINCENT, F.R.S.E.,

F.C.S. (LONDON AND BERLIN),

ASSISTANT IN THE LIBRARY OF THE ROYAL INSTITUTION OF GREAT BRITAIN.

Mr. Cottrell's Experiment showing reflection of Sound from Flame and Heated Air.

LONDON :

WARD, LOCK, AND TYLER, WARWICK HOUSE,

PATERNOSTER ROW.

MDCCCLXXV. 6.