TO 



Pro[ . T. H. HUXLEY, LL.D., F.R.S., F.L.S., F.Z.S. 



Correspondant dc V Institnt de France 

 Pasf-F resident of the Royal Society, etc. etc. 



WHO HAS CREATED A NEW EPOCH IN BIOLOGY ; AND WHOSE 



GENIUS HAS DONE SO MUCH TO AWAKEN THE KEENEST 



INTEREST IN THE STUDY AND POPULARISATION 



OF SCIENCE 



ZUe Work is (bv; pcmission) H)e&icate& 



AS 

 A TOKEN OF ADMIRATION AND RESPECT 



BY 



THE AUTHOR 



