1256 A TEXTBOOK OF THEORETICAL BOTANY 



whose work on cross-fertilization we have already mentioned. Apart from 

 this, his discovery of the importance of heterostyly and of the manifold 



Fig. 1203. — Hermann Muller. Author 

 of "The FertiUzation of Flowers." 



and wonderful pollination mechanisms among Orchids stands out con- 

 spicuously. 



A vast amount of detailed knowledge was brought together by Hermann 

 Muller (Fig. 1203), especially from his experience of the Australian flora, 



Fig. 1204. — Paul Knuth. Author of the 

 " Handbook of Flower Pollina- 

 tion ". 



Fig. 1205. — Anton Kerner von Mari- 

 laun. Author of " The Natural 

 History of Plants ". 



and the great compendium of information by Knuth (Fig. 1204) is still the 

 chief work of reference on the subject. The most readable and humane 

 account of floral biology is, however, to be found in Kerner's (Fig. 1205) 



