566 



WHITE— STUDIES OF INHERITANCE IN PISUM. 



similar size and soil contents under the same environmental condi- 

 tions and taking data on the total dry plant, seed and straw weight 

 per pot, weight per i,ooo seeds, the average number of pod-carrying 

 internodes and pods per plant and the average number of seeds and 

 seed " Anlagen " or ovules per pod. In crosses between varieties 

 or pure lines differing in these respects, the F^ progeny gave various 

 results, depending on the varieties crossed and the character consid- 

 ered. In all crosses, the individuals of one pure line culture of the 

 variety Victoria were used as one of the parents, the other parents 

 being from pure lines of Russian and Finnish field pea varieties. 

 The Fi results as given by Relander are in figures with which fig- 

 ures from the two parent varieties are given for comparison. Table 

 A roughly represents the character of the F^ progeny in terms of 

 the parent characters. Intermediate means only approximate in- 

 termediate condition, Relander's figures showing that the produc- 

 tivity in most of the cases marked intermediate was nearer that of 

 the more productive parent. 



TABLE A. 

 Different Fi Varietal Crosses. 



Character. 



VI. 



Total weight of dry plant per 

 pot 



Total seed weight per pot. . . . 



Total straw weight per pot . . . 



Weight per 1,000 seeds (only 

 fully mature, well-developed 

 seed used) 



Ave. no. of pod carrying inter- 

 nodes per plant 



Ave. no. pods per plant 



Ave. no. seeds per pod 



H.E.P. 

 H.E.P. 

 Int. 



Int. 



H.P. 

 H.P. 

 Int. 



H.P. 



H.E.P. 



L.P. 



Int. 



Int. 

 Int. 

 H.E.P. 



H.P. 



H.E.P. 



Int. 



Int. 



Int. 

 Int. 

 H.E.P. 



Av. no. of ovules or seed "An- 

 lagen " per pod 



All intermediate but nearer the high producing 

 parent. No data on No. VI. 



H.E.P. = Higher than either parent. 



H.P. = Dominance of more productive parent. 

 L.P. = Dominance of less productive parent. 

 Int. = Intermediate. 



Relander interprets the differences in her results as due to dif- 

 ferences in factorial composition of the different varieties she used. 

 She does not believe that the increased productivity obtained in 



