CONTRASTING TYPES OF 

 CACTUS 



At the left, a colony of the spine- 

 less cactus called the "Tapuna'; at 

 the right a quite different type called 

 the ''Tuna.'" Like all Mr. BurhanVs 

 spineless cactuses, these are crossbred 

 seedlings; and they are of closely 

 similar lineage, notwithstanding their 

 widely different appearance. An in- 

 stance of the segregation of hereditary 

 characters. 



