26 RUBBER AND 



Other Species of Manihot. 



In 1907 extensive reports were published in Germany 

 emphasising the importance of Manitoba rubber as dis- 

 tinguished from ordinary Ceara. This rubber was said 

 to be derived mainly from three species of Manihot 

 M. dichotoma, M. heptaphylla and M. piauhyensis. 

 Formerly it appears to have been confused with the 

 produce of Hancornia speciosa. The seed of the above- 

 named species of Manihot has been widely advertised 

 for planting in tropical countries, but the small amount 

 of evidence at present available seems to show that they 

 are all less satisfactory than M. Glaziovii for plantation 

 purposes, Very large yields have been attributed to 

 young trees of the Manitoba species in Brazil. The 

 tapping of M. dichotoma is usually carried out with the 

 knife. When the latex is collected in vessels it begins 

 at once to coagulate. It is then moulded with the hands 

 into balls, which are usually pressed between rollers and 

 afterwards thoroughly dried. Manihot piauhyensis and 

 M. heptaphylla, on the other hand, are tapped at the 

 base of the stem, and the latex allowed to flow upon 

 the ground. 



Castilloa. 



Castilloa elastica is the source of the Ule rubber 

 of Central America and of the Caucho rubber of Peru. 

 The species extends from the South of Mexico to the 

 North of Peru, where it is separated from the territory 



