the 
MONTHLY MAGAZINE 
CONDUCTED EY 
C. G. BARRETT. 
J. W. DOUGLAS. 
R. McLACHLAN, E.R.S. 
E. C. RYE, E.Z.S. 
E. SAUNDERS, P.L.S. 
H. T. STAINTON, E.R.S. 
VOL. XVII. 
“ In 
relation to the human mind Nature is boundless ; and though nowhere 
inaccessible, she is everywhere unfathomable.” 
' T4 tttt t trv 
V 
LONDON : 
JOHN 
VAN VOORST, 
1, PATERNOSTER 
R O W. 
18 8 0 - 81 . 
