THE 
POPULAR SCIENCE 
REVIEW. 
A QUAETEELY MISCELLANY OF 
ENTEET AININ Gr AND INSTEUCTIYE AETICLES ON 
SCIENTIFIC SUBJECTS. 
EDITED BY HENRY LAWSON, M.D. 
* VOLUME XI. 
LONDON: 
ROBERT HARDWICKE, 192 PICCADILLY; 
AND ALL BOOKSELLERS. 
1872. 
