THE NETHERLANDS EAST INDIES 271 



certainly much of the enthusiasm in Java for inter- 

 planting rubber with coffee and other products arises 

 from the desire to earn profits at an early date. The 

 following is an approximate cost of the annual main- 

 tenance of an estate of 1,000 acres of six to seven-year- 

 old trees, planted 20 feet by 15 feet (149 trees to i acre), 

 or 20 feet by 20 feet (108 trees to i acre), and yielding 

 a crop of 280,000 pounds of dry rubber : 



Guilders. 



1. Rent, 1,000 acres at i guilder per acre 1,000 



2. Tapping and collecting (including 



50 per cent, depreciation on cups, 

 buckets, implements, etc.) 117,600 



3. Curing and preparation (including 



20 per cent, depreciation on factory 



and machinery) 11,250 



4. Transport, shipping-charges, and com- 



mission 5,6oo 



5. Management manager, two assistants, 



two clerks 11,250 



6. Weeding (60 cents per acre) 6,000 



7. Maintenance of roads and drains ... 6,000 



8. Cultivation 8,500 



9. Manuring 8,500 



10. Depreciation of buildings other than 



factory 6,000 



11. Hospital and medical attendance 



(optional, but necessary) 5,000 



12. Contingencies (taxes, etc.) 5,ooo 



Total 191,700 



( = 15,975) 



An allowance of 8^ guilders per acre has been made 

 for manuring, as with the prevailing system of catch 

 crops of coffee or other products some return to the 

 soil is necessary. 



