CROSSING. 



81 



In the F 2 of this cross between species, the variability was 

 prodigious. All sorts of new colours were produced, such as sal- 

 mon, lemon yellow, blueish, and some plants had more or less 

 double flowers. Double-flowered strains of different colours 

 have by now been fixed as domestic species. The seed firm of 



Fig. 11. 

 The result of a cross between two species of Argemone. 



Vilmorin Andrieux and C. in Verrieres, produced hybrids be- 

 tween two species of horned poppy, Argemone mexicana and 

 A. platyceras. Both these species have flowers composed of six 

 petals of equal size, small and yellow in mexicana, and big and 



6 



