200 RUBBER AND 



scale, and the amount of land available for the cultivation 

 is limited. In Jamaica a yield of 200 Ibs. per acre is 

 anticipated from Castilloa after the tenth year. This 

 form of rubber has also been planted somewhat widely 

 in German colonies, particularly in New Guinea. 



In spite of the small yields per acre, Castilloa is still 

 -regarded by some writers as being the most suitable 

 form of rubber for plantation purposes in Mexico, owing 

 to the small cost of collection. Although the total yields 

 are small, the yield from a single tapping is very much 

 larger than in the case of Hevea at the same age. The 

 cost of labour is very much higher in Mexico than in 

 either Africa or Asia. 



Manihot. 



Ceara rubber, Manihot Glaziovii, was the third 

 species to be widely distributed to British possessions 

 in the Tropics during the seventies. Introduced to Kew 

 from North East Brazil by Cross in 1876, seeds or plants 

 were sent out to most of the tropical colonies during the 

 following year. In Ceylon this species attained a certain 

 amount of popularity some years before Hevea came to 

 be at all widely planted. Manihot was planted in the 

 Trincomalee district in 1880, where, however, in spite of 

 the richness of the soil, planting has made but little 

 headway. Nevertheless, in 1883, no less than 977 acres 

 were under cultivation with this product in Ceylon. 



Difficulties of tapping, which have not even now 



