XI 



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FIG. 21. Hevea Plantation in Province Wellesley, overrun with 

 Lalang. The Hevea is here and there only slightly 

 visible facing 52 



22. Hevea Plantation 3 years old, between which sugar-cane 

 is cultivated as a Catch Crop; here and there reeds 

 are still to be seen facing 54 



23. Liberian Coffee as a Catch Crop. Hevea on an estate 

 in Serdang, on the left with Coffee, on the right, without. 

 Age of Liberian Coffee, 2% years old, of the Hevea 

 with Coffee, i year and 7 months, of the Hevea without 

 Coffee 2 years facing 56 



24. Topped Hevea Plantations in Serdang. The trees are 

 about 5 years old, planted in an old Liberian Coffee 

 plantation. In consequence of the topping, the trees 

 have formed a heavy crown. The neighbourhood of 

 the Hevea has a deadly influence on the Coffee . . . 



facing 58 



25. Results of topping 62 



26. Destroying Fungus on an estate near Klang. A Hevea 

 plantation 3 years old. The dead Hevea has been dug 

 up, piled and burnt facing 66 



27. Sketch showing the rolled out bark 74 



28. Sketch showing tapping systems 76 



a. Whole Spiral. 



b. Half Spiral. 



c. V cut. 



d. Full Herringbone. 

 <?. Half Herringbone. 



f. Two Half Herringbones. 



g. Two Half Herringbones, opposite quarter sections. 



29. Herringbone over half the surface of the tree. . . facing 80 



30. Half Herringbone over a quarter of the surface of the 



tree facing 82 



300. Sketch showing tapping of renewed bark 84 



31. Sketch showing the setting out of the tapping lines, with 



a tin template. For explanation see text 89 



