88 CARNEGIE INSTITUTION OF WASHINGTON. 



The reproduction of this plant by its tubers makes it possible to 

 preserve each generation for comparison, as a result of which some of 

 the first, second, and third generations are now represented. Flower 

 and foliage characters of the smaller wild parent continue to deter- 

 mine the general aspect of the shoots and flowers even in the third 

 generation. Only tubers of small size have yet appeared in the cul- 

 tures. It is to be noted that the tubers produced by plants grown 

 from seed may not reach the maximum and that two or three seasons 

 of propagation by tubers may be necessary to accomplish this. About 

 a dozen strains of possible economic importance are receiving special 

 trial in a plot of virgin soil. The hybrid in general shows increasing 

 vegetative vigor with each successive generation produced by seed . The 

 technical analyses of the reactions of the qualities of the parental species 

 will be reserved for detailed description. 



