August 1, 1911. 



THE INDIA RUBBER WORLD 



429 



Mr. Stockdale, in his paper, demonstrated the British 

 Guiana government's progressive policy in establishing many 

 branch experiment stations of the Department of Science and 

 Agriculture. In practically all the most important districts of 

 the colony these experiment stations are already dcrtnitely es- 

 tablished or are in the making. The trials with Hevea at the 

 experiment stations and on numerous private properties through- 

 out the colony have shown that excellent grow'th is obtained prac- 

 tically all over the colony. He also covered the Saf'ium Jenmani 

 in its natural habitat qnd under cultivation, and explained culti- 

 vation and its yield. 



Turning from rubber the lecturer gave particulars of the balata 

 industry which were most complete and interesting. 



"African Vine Rubber." G. van den Kerckhove, consulting 

 india rubber expert, Brussels.. 



^Ir. van den Kerckhove in his paper pointed to meas- 

 ures taken against adulteration of indigenous rubbers ; spoke of 

 adulteration in tlie Congo, and of stringent laws which in time 



Schidrowitz, Ph. D., F. C. S., and H. A. Goldsbrough. A. T. C, 

 F. C. S. 



Dr. Schidrowitz and Mr. Goldsboro added to what they have 

 already written on the viscosity of rubber solutions, giving many 

 e.xamples of experiments on plantation Hcrca and Fuiitiiinia, 

 They found in deresinated rubbers an increase in viscosity, as 

 indeed would be expected. The practical value of these tests are 

 that within the same species viscosity measurements give a di- 

 rect line as to strength, general conditions and vulcanizing 

 capacity. 



"Rubber in Uganda: Retrospective and Prospective." R. 

 Fyffe, Esq., assistant in Botanical Forestry and Scientific Depart- 

 ment, Entebbe, Uganda, and E. Brown, F. L. S. (Joint 

 papers.) 



Rubber in Uganda, by Mr. R. FyiTe, covered an increase in ex- 

 ports: in the consideration of three native species — Fuiitumia, a 

 Landolphia and a Clitandra. and where they grow, and the tap- 

 ping of wild vines and coagulating by bdilint;. I'untumia shows 



A. D. ClLL.\RD, 



Editor, Lc Ciioutcliouc et La Gutta Perdia, 

 Paris. 



Dr. Werner Esch, 

 Editor, Guinini Markt, Hamburg. 



H. H.\MEi. Smith. 

 Editor, Tropica! Life, London. 



resulted in stamping out frauds. He said that during "boom 

 times" in crude rubber things began to drift back to their former 

 state, but that a royal decree had put an end to that trouble. 



"Theory of Ihe Vulcanization Process." Prof. D. Hinrich- 

 sen, permanent member of the Roj'al Department for Testing 

 Material. Berlin. 



Dr. Hinrichsen spoke of the two theories, explaining tlie 

 phenomena of vulcanization, one chemical and the other physical. 

 He described the latter as the newer, and held that the taking up 

 of sulphur by rubber was an exclusively surface action. He also 

 reviewed the experimental evidences relating to both theories. 



■■Rubl)cr Plantations in Cochin China." M. Andre Cremazy. 



M. Cremazy covered Frencli Cochin China very thor- 

 oughly. Hevea Brasiliensis is doing remarkably well, one com- 

 p.iny alone possessing 200,000 trees. So far the Hevea trees are 

 free from disease of any kind, said the lecturer, and labor was 

 very easily obtainable ; the government regulations most favorable 

 to planters. 



"The Viscosity of Rubber and Its Solutions." Philip 



no wound response and will stand three to four tappings a year, 

 the herring bone being the best. Trees may be tapped to a 

 height of 20 to 30 feet. The "V" knife is generally used, but a 

 pricker is advised. Results are disappointing, five to six ounces 

 of dry rubber per year being the average yield. Ceara rubber 

 shows up well ; it is tapped after removing the outer bark, smear- 

 ing the tree with a coagulant and using a pricker. Twenty three- 

 year-old trees yielded 27 ounces of dry rubber. The first Para. 

 tree tapped, a seven-year old, yieUled 16 1.2 ounces dry rubber; 

 118 Hevea trees, five months old, yielded 50 pounds dry rubber. 

 These trees were 20^ inches in circumference. 



"The Hygienic Conditions and the Maintenance of Health 

 in the Rubber Planting Districts of the Tropics." W. 

 Carnegie Brown, M. D., M. R. C. P., 32 Harley street, W. 



Dr. Brown suggested much of value as far as laborers are con- 

 cerned. For a white man going to the tropics he affirmed he 

 must be mature, have no alcoholic tendencies, nor tendency to 

 insanity; must be scrupulously clean, careful of what he eats 

 and drinks. Believes that malaria and similar diseases could be 

 easily avoided or combated. 



