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1 i L, bo THE QUARTERLY 
JOURNAL OF SCIENCE, 
AND ANNALS OF 
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Wie wks Oe 8 ahs 
MINING, METALLURGY, ENGINEERING, ENDUSY YRDAL ARTS, 
MANUFACTURES, AND ) TECHNOLOGY. 
EDITED BY 
No. XLI. 
WILLIAM CROOKES, F.R.S., &c. 
Ae ie SS ie Sew es = Sia atelege = hy de” Sp 
| LONDON: 
OFFICES OF THE QUARTERLY JOURNAL OF SCIENCE, 
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