INDEX. 



Rubber Cultivation ... 6 



Foreword ..... 7 



Rubber in its Infancy ... 8 



Cultivation of Castilloa Elastica in Mexico 9 



Rubber and its Composition . . 12 



La Zacualpa Rubber Plantation . . 14 



Castilla Lactiflua . . . . 15 

 The Story of Castilloa Elastica on 



La Zacualpa . . . 18 



Blossoms ..... 30 



Seeds 30 



Planting .... 31 



Old Method of Tapping . . 33 



New Method of Tapping . . 36 



Latex 37 



Coagulating Native Method . . 38 



Cleansing ..... 38 



Preparing for Market New Method . 39 



Vulcanizing ..... 40 



6736G9 



