Vigor Through Crossbreeding 



At the left a hybrid tomato which has altogether oat- 

 stripped a representative of one of its parental forms, shown 

 at the right. Similar illustrations of the extraordinary vigor that 

 hybrid plants sometimes take on has been shown in earlier vol- 

 umes. The contrast here, however, is peculiarly striking. 

 Here the giant seedling is probably only mimicking 

 some equally gigantic ancestor, as we should 

 learn could we trace its full pedigree. 



