Man a Creator 51 



each case the new variety suddenly put in its 

 appearance in its perfect condition. All the 

 breeder had to do was to recognize the value 

 of the new type. 



The truck-garden region about Chicago is 

 the greatest cabbage growing area in the world. 

 Many of the farmers of northwestern Indiana, 

 northern Illinois, and southern Wisconsin have 

 devoted themselves exclusively to this one crop. 

 Within a generation, however, the region has 

 been invaded by a very serious disease, the 

 "yellows," that attacks the young plant, 

 withering and killing it. Fields that formerly 

 produced tons of cabbages now yield abso- 

 lutely none, and the virus seems to remain 

 persistently in the soil even after other crops 

 have been grown for several years. The plant 

 pathologist of the University of Wisconsin was 

 called in to help solve the trouble. The 

 situation was studied for several years without 

 avail. Then in the midst of a fifteen-acre field 

 two lusty cabbage plants were found with well- 

 formed heads, although all their companion 

 plants had succumbed to the dread disease. 



