PREFACE. xxx i 



matchless traditions of its glorious past. What the 

 AVartburg was to Martin Luther, what Weimar has 

 been to the foremost heroes of German literature, what 

 Jena herself has been during three hundred years to a 

 vast number of illustrious investigators, that will the 

 tried and tested Jena of to-day undoubtedly continue 

 to be to the modern doctrine of evolution, as to every 

 other doctrine which asks free development ; a strong- 

 hold of free thought, free investigation, and free 

 doctrine. 



ERNST HAECKEL. 



JKNA, June 24tk, 1878. 



