8 TRANSLATOR'S PREFACE. 



me to Darwinism. Here, as elsewhere, I 

 trusted to the grand principle of analogy 

 which underlies so many more of the mys- 

 teries of nature. 



Ever since 1864, when Fritz Mueller 

 published his remarkable pamphlet, "fuer 

 Darwin," a test of Darwinism by one parti- 

 cular group of animals, the Crustacea, it 

 occurred to me that other investigators of 

 natural science might apply the main prin- 

 ciples laid down in the " Origin of Species" 

 to their own particular branch of study. 



It is but fair to say that Dr. Mueller had 

 been forestalled in his attempt by one of his 

 countrymen, August Schleicher, a distin- 

 guished glossologist, and a Professor at the 

 University of Jena. His open missive (or 

 public letter) to Professor Ernst Haeckel, 

 his learned colleague and the great cham- 

 pion of Darwinism in Germany, is the 

 pamphlet here presented in an English garb. 



