ig8 
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, anywhere else. 
