198 A GLIMPSE OF RUBBER PLANTING 



has studied the Castilloa carefully. While not a botanist in the strictest 

 sense of the term, his description of the varities of the Castilloa is of 

 distinct value. He divides the Castilloa of Costa Rica into four species, 

 the white, the black, the red, and the "tunu," the first three being all 

 varieties of the Castilloa elastica. Botanists so far have not followed his 

 discrimination carefully, and it is a question if rubber planters have made 

 any distinction, nor has it been proved necessary. Of course, it would 

 not pay planters to raise "tunu" gum instead of Panama rubber, but so 

 far as we know, no such planting has ever been done in Costa Rica, or, 

 indeed, anvwhere else. 



