EDITED BY 



DIONYSIUS LAEDNEE, D.C.L., 



Formerly Professor of Natural Philosophy and Astronomy in University College, London. 



ILLUSTRATED BY ENGRAVINGS ON WOOD. 

 YOL. IV. 



LONDON : 

 WALTON AND MABERLY, 



UPPER GOWER STREET AND IVY LANE, PATERNOSTER ROW. 

 1854. 



