THE NETHERLANDS EAST INDIES 285 



sion of the growth of the Robusta, Quillou, and Uganda 

 coffees will be accompanied with a corresponding in- 

 crease in the area under rubber, for the planting of the 

 latter can be done without cost except for nurseries and 

 putting out the plants in the fields. The Dutch planter 

 likes to have two strings to his bow, and many of them 

 aver that they would always put in coffee and rubber 

 together and decide later on which crop w r ould pay them 

 best to retain under cultivation. 



The Java industry is still in its preliminary stages of 

 development, and therefore it is impossible to obtain 

 reliable returns over definite areas on which to base 

 accurate calculations of averages. Many estates have 

 thousands of trees in tapping, but for the most part 

 only begun during the last two years, and too scattered 

 to give representative results per acre. The following 

 yields per tree in various districts only serve as an 

 indication of general conditions : 



* 120 trees eleven years. 



t Tapping only just begun. 



