2SO 



GENETICS IN RELATION TO AGRICULTURE 



also had considerable more red pigment in the epidermis. This was 

 especially marked in the marginal region of the sepals (see Fig. 118) 

 and on the developing fruits. This form was named rubrinervis and 

 since it bred true when self-fertilized it was considered a well-defined 

 "progressive" species, i.e., a species capable of maintaining itself in the 



Fio. 116 (E. lamarckiana, lata and nanella. (From colored plate w de Fries' MutaAions- 



theorie, vol. 2.) 



wild state. In the fourth generation four additional forms were found. 

 One of these, gigas, appeared only once in de Vries' cultures but the 

 one plant found in 1895 produced nearly 300 plants of gigas type from 

 self-fertilized seed and the strain bred true thereafter. In recent years 

 it has appeared a number of times in other strains of lamarckiana. 

 This form is decidedly more robust than lamarckiana and the leaves are 



