THE 
POPULAR SCIENCE 
REVIEW. 
A QUARTERLY MISCELLANY OF 
ENTERTAINING AND INSTRUCTIVE ARTICLES ON 
SCIENTIFIC SUBJECTS. 
EDITED BY HENRY LAWSON, M.D. 
VOLUME VI. 
L 0 N D 0 N : 
KOBERT HARDWICKE, 192 PICCADILLY; 
AND ALL BOOKSELLERS. 
1867. 
