PLANT HYBRIDIZATION BEFORE MENDEL 



167 



tion to the volume for 1778 contains, in the words of Sachs, 

 "valuable reflections on sexuality in plants." 



In 1830, two years after the appearance of Wiegmann's mem- 

 oir, the Dutch Academy of Sciences at Haarlem, in turn, pro- 

 pounded anew the riddle of hybridization in the following words : 



"what does experience teach regarding the production of new species 

 and varieties, through the artificial fertilization of flowers of the one 



Plate XXIV. Present site in Calw of a portion of the former experimental garden of 

 C. F. von Gartner. 



with the pollen of the other, and what economic and ornamental plants 

 can be produced and multiplied in this way?" 



No reply was received (January 1, 1833), and the offer was 

 accordingly renewed for another three years until January 1, 

 1836. 



In October, 1835, Gartner learned of the prize offer, and was 

 able to present a brief resume of his work up to that time, which, 

 indeed, prompted a further extension of time on the part of the 

 Academy. Gartner finally presented the Academy with a memoir 

 of two hundred pages, and with herbarium mounts of one hun- 

 dred and fifty different sorts of hybrid plants produced by hand 



