RUBBER PLANTING 



243 



Parkes, discovery by, 218 

 Parkin, experiments by, 60 



incision method employed by, 

 64 



pricking methods, 131 

 Parthenium argentatum (Guayule 



rubber), 29 

 Pearson, H. C., 230 

 Peradeniya, Ceara at, 204 

 Petch, T., on blemishes in rubber, 



I7 , 3 , 

 on dead stumps, 195 



on fames semitostus, 185 



on tackiness, 175 

 Phloem tubes, 41, 45, 49 

 Phosphates, in manuring, 116 

 Physiology of latex production, 



38 



Phytophthora Faberi, 187 

 Pink disease (Corticium salmoni- 

 color], 190 



Bordeaux mixture for, 190 

 Plantation industry, rise of, in the 

 East, 10 



rubber, best form of, 170 



yields, 151 



yields, in Ceylon, 152 



yields, in Malaya, 152 

 Planting distances, in Ceylon, 107 



distances, in Malaya, 106 



hexagonal, 108 



on the square, 108 

 Polymerisation, 55, 215 

 Potash, in manuring, 116 

 Price of rubber, 14 

 Pricker, Bowman-Northway, 132 

 Pricking, by Parkin, 131 



by Trimen, 131 



effect of, 58 



methods, 133 



objections to, 132 



Wright on, 130 

 Production from estates, 12 

 Pruning, 120 



thumb nail, 120 

 Pure rubber, 210 



composition of, 211 



Quality, 171 



Railway buffers, 228 

 Rainfall at Henaratgoda, 72 



at Peradeniya, 61 



effect on yield, 73 

 Reclaimed rubber, 234 

 Renewal of bark, 49 

 Resiliency of rubber, 171 

 Response of trees to certain stimuli, 



65 



Resting periods, 89 

 Rhizomorphs, 185 

 Roads, 103 

 Root rubbers, 33 

 Roots, diseases of, 183 

 Rubber, acreage under, 12 



African species of, 30 et seq. 



American species of, 17 et seq. 



analyses of, 86 



approximate composition of, 

 212 



Asiatic species of, 34 et seq. 



balls, early mention of, 3 



biscuit, 154, 212 



block, 164, 167 



botanical sources of, 16 



capital in, 15 



chemical indifference of, 213 



chemistry of, 210 et seq. 



collection of, in Brazil, 19 



defects in, 173 



discovery of, 3 



early uses of, i 



estate, site of, 96 



exports of, from Brazil, 4 



exports of, from East, 13 



globules, size of, 53 



goods, manufacture of, 220 et 

 seq. 



goods, testing of, 236 



loss of weight in washing, 160 



markets, 169 



method of collection, 3 



molecule of, 215 " 



percentage in latex, 83, 92 



physical properties, 212 



planting, birth of industry, 5 



price of, 14 



quality of, 171 



reclaimed, 233 



