356 Tricofylous Races, 



from a group like this the plants with the smallest values 

 are selected for the continuation of the culture, values 

 which are equal to or even smaller than the best ones of 

 the half race can be obtained. Here also the variability 

 is of the transgressive kind; but it does not result in the 

 transition from one race to the other. 



Half races and intermediate races are, therefore, with 

 regard both to the forms of their individuals and the 

 magnitude of their hereditary capacities highly variable 

 races. On the other hand they are perfectly constant 

 inasmuch as neither race can be transformed into the 

 other artificially. They behave like the majority of ever- 

 sporting races of other anomalies. ■"• 



§ 2. TRICOTYLS, HEMI-TRICOTYLS, AND TETRACOTYLS. 



The opinion, prevalent amongst gardeners, that hy- 

 brids are intermediate in form between their parents, and 

 that intermediate types, therefore, should be regarded 

 as hybrids, might easily lead to the assumption that the 

 hemi-tricotyls are hybrids between tricotyls and dicotyls. 

 Intermediate they are without any doubt, especially when 

 the cotyledons are cleft over half their length. But the 

 occurrence of a continuous series of intermediate forms 

 between di- and tricotylous plants proves the incorrect- 

 ness of this view, or at least indicates that it does not 

 cover all the facts. The question has to be decided by 

 experiment. For this reason I have made a series of 

 crosses between dicotyls of a half race, and tricotyls of 

 the corresponding intermediate race. Although I always 

 paid especial attention to the occurrence of hemi-tricot- 

 ylous seedlings amongst their results, they were just as 



^ See above, p. 22. 



