vi Preface 



History of Zoology by Carus and the History of 

 Botany by Sachs. But neither of these extends 

 beyond Darwin's day. 



If I might venture to associate this little book 

 with a great name, I should dedicate it with much 

 gratitude to one of my teachers Ernst Hseckel 

 whose life has been so closely bound up with the 



advancement of modern Biology. 



J. A. T. 



ZOOLOGICAL LABORATORY, 



School of Medicine of the Royal Colleges, 

 Edinburgh. 



