1916] DEVRIES—DIMORPHIC MUTANTS 273 
described in that book as O. cruciata Nutt. The other names are 
still the same as in my book. 
With the same purpose crosses were made with O. Lamarckiana 
and some of its derivatives. 
TABLE X 
Crosses OF O. cana witsa O. Lamarckiana AND ITS MUTANTS 
{ 
Crosses | ee of — Percentage of other forms 
O. cana XO. Lamarckiana.. ... 42 Oe andes ae ore ees 
O. canaXO. nanella.......... 21 71 8 nanella 
O. canaXO. rubrinervis. ..... 40 25 35 subrobusta 
euckianaxe cana ° 98 2 nanella 
. WO. Ce I 62 35 lata, 3 mutants 
O. nanellaXO. cana......... I 5 94 nanella 
5 oblonga XO. cana ........ ° 82 15 oblonga, 3 mutants 
O. rubrinervisXO. cana ..... re) 52 48 subrobusta 
The main result is the same. In all the crosses of both tables 
the characters of O. cana are handed down through the ovules to a large 
part of the progeny, but not through the pollen. The behavior is 
exactly the same as in O. scintillans and O. lata. The two speci- 
mens of O. cana from the crosses of O. Jata and O. nanella must 
evidently be considered as mutants, that is, as having arisen from 
the fertilization of mutated sexual cells, since we have seen that 
such mutations occur from time to time, especially among the 
seeds of O. lata. 
Apart from the appearance of plants of the cana type, the 
results of the crosses are, in every case, such as would be expected 
if O. Lamarckiana had been used instead of O. cana. In this 
respect they simply confirm the conclusions given in my book. 
Let us now consider in its details the analogy of O. cana with 
the allied forms of O. scintillans and O. lata. Two cases offer 
themselves for this consideration. The first one is afforded by 
the crosses with O. biennis. Apart from stray mutants, these 
produce two types, one of which combines the visible marks of 
both parents, whereas the other wholly lacks the characters of the 
mother, but is simply like the hybrid of O. Lamarckiana and 
O. biennis, as described in my book. In the first group the com- 
bination is such as to make the characters of the mother the most 
