are too many, when the trees are older, and they have to be 

 thinned out. At is. 6d. a Ib. the yield per acre would be 

 about Rs. 1 12 and the margin of profit may come to half this 

 amount. 



(2) Ceara rubber is the product of Manihot glaziovii, 

 a plant which resembles the cassava. The experiment of 

 growing this in Ceylon has failed. The tapping hardly paid 

 for the weeding, and after 6 years the plants were too dry to 

 yield rubber. The bushes can however be grown for their 

 roots which yield a valuable starch like the ordinary 

 cassava. 



(3) Ule tree rubber, which is almost as good as para rubber, 

 is the product of Castilloa Elastica (belonging to Moraceas), a 

 Central American fast growing tree, allied to the bread-fruit 

 tree. It is easily propagated from seed or cuttings. 7 or 

 8-year-old trees yield i to 2 Ibs. per annum, 25 % of the 

 milk being pure rubber, separated by centrifugal machine. 

 This tree has been also introduced into Ceylon, but experi- 

 ments so far have not given encouraging results. Castilloa 

 milk flows more freely and does not coagulate readily, which 

 is a great advantage when a centrifugal machine is used. No 

 return can be expected within 8 years after planting. The 

 Castilloa successfully introduced into Ceylon in 1876/18 the 

 C. Markhamiana, from Darien (Panama). They flowered in 

 1881. The growth since 1886 has been slight. It does 

 well in warm, steamy, alluvial localities and does not do 

 well in elevated tracts nor in swamps. The temperature 

 should never fall below 60 F, the rainfall should not be 

 below 70 inches, and it should be well distributed. It should 

 be planted in sheltered places near streams, but where the 

 land is well drained. Para rubber does well in wetter places. 

 The seed should be sown in a well prepared nursery i" deep 

 and 8" apart and lightly covered with vegetable mould. The 

 nursery should be kept lightly shaded and watered and in 10 

 or 12 months when the seedlings are 2 ft. high they are 



