THE 
JOURNAL OF SCIENCE 
AND ANNALS OF 
ASTRONOMY, BIOLOGY, GEOLOGY, INDUSTRIAL ARTS, 
MANUFACTURES, AND TECHNOLOGY. 
(MONTHLY, FORMERLY “THE QUARTERLY JOURNAL OF SCIENCE,”) 
VOL. VI. (*»'«») 
VOL. XXI. (O.S.) 
LONDON: 
3, '.HORSE-SHOE COURT, LUDGATE HILL. 
— FXJ — 
MDCCCLXXXIV. 
