THE QUARTERLY 
JOURNAL OF SCIENCE, 
AND ANNALS OF 
.‘MINING, METALLURGY, ENGINEERING, INDUSTRIAL ARTS, 
MANUFACTURES, AND TECHNOLOGY. 
EDITED BY 
WILLIAM CROOKES, F.R.S., &c. 
vol. vi. ( s ^:,) 
VOL. XIII. (O.S.) 
WITH ILLUSTRATIONS ON COPPER., STONE, AND WOOD 
OFFICES OF THE QUARTERLY JOURNAL OF SCIENCE, 
3, HORSE-SHOE COURT, LUDGATE HILL. 
^ ar i s : I Leipzig : 
3 FRIEDRICH KLINCKSIECK. | ALTON S DURR. 
Berlin : 
A. ASHER and CO., 53, MOHRENSXRASSE. 
— =-* 
MDCCCLXXVI, 
