THE 
POPULAE SCIENCE 
REVIEW. 
A QUARTERLY MISCELLANY OF 
ENTERTAINING AND INSTRUCTIVE ARTICLES ON 
SCIENTIFIC SUBJECTS. 
EDITED BY HENRY LAWSON, M.D. 
VOLUME VII. 
LONDON: 
ROBERT HARDWICKE, 192 PICCADILLY; 
AND ALL BOOKSELLEES. 
1868. 
