THE 



RIDDLE OF THE UNIVERSE 



AT THE CLOSE OF THE NINETEENTH CENTURY. 



BT 



ERNST HAECKEL 



(Ph.D., M.D., LL.D., Sc.D., and Professor at the University of Jena). 



TRANSLATED BY JOSEPH HcCABE. 



ISSUED BT 



THE RATIONALIST PEESS ASSOCIATION, Limited. 



WATTS & CO., 

 17, Johnson's Court, Fleet Street, London, E.C. 



