430 



THE INDIA RUBBER WORLD 



[August I, 1911. 



"The Rubber Trees of Africa. Their Cultivation and Ex- 

 ploitation." Dr. E. Wildenian. 



Dr. Wildenian described native methods of collecting vine 

 rubber. He said that cutting the vine off did not kill it, for it 

 reproduced itself. He also suggested that mechanical treatment 

 of vine sections might be possible, and believes that the cultiva- 

 tion of vines in .\frica will yet be accomplished 



"Discovery of the Para Reagent." W'ilhclni Pahl. Dort- 

 mund. 



Herr Pahl spoke of smoke coagulation and carbonic acid. 

 Criticised the use of acetic acid and described the apparatus for 

 coagulating large quantities cf latex by the use of carbonic acid. 

 He also stated that his lirni had patented this use of carbonic 

 acid all over the world and was prepared to defend their right. 



"Rubber Trees of the .\mazon." Dr. J. Hubcr, Para, Brazil. 



Dr. Huber covered chiefly the rubber reserves of the .\mazon. 



He believes that the rubber tree of the lower .'\mazon is the 



ered a notable address on the sweeping reforms in the Belgian 

 Congo. He affirmed an absolute abandonment of the working of 

 estates by monopoly ; the native's right to gather rubber with no 

 tax. His ability to sell at market price wherever he wishes. For- 

 eign settlers can occupy any tract not already leased ; can buy 

 of the native or collect rubber by their own labor. He pro- 

 claimed the method of government as "free trade by free labor." 



Mr. Clayton Beadle described a new method of testing rub- 

 ber 1)y using the energy of a falling pendulum. He suggested it 

 as a quicker and easier way of testing than any now in use. 



Dr. Henry Stevens in his paper on raw rubber tests devoted 

 himself very largely to results obtained by Professor Schwartz's 

 hysteresis machine, illustration and description of which appears 

 in another column. 



Mr. H. Hamel Smiths paper covered chiefly the labor question, 

 particularly in the Malay States. He figured that a million labor- 

 ers were needed for the Malav States and as many more for 



"The I.NlllA RfBBER Jnl-RN.\L" Trophv. 



"The Indi.\ Rubber VVorlii" Trophy. 



"Gremer's RiBBER News" Trophv. 



Brasiliensis, while that of the northern regions is the Bcnthani- 

 iana, which produces a rubber nearly equal to the Brasiliensis. 

 He predicted a considerable increase in the quantity of rubber 

 from the lower .Amazon. 



"Some Diseases of Herea Brasiliensis." E. Mitchell. 



Mr. Mitchell covered llez-ea diseases very thoroughly. The 

 white ant, canker, leaf, bark and root diseases were discussed 

 very thoroughly and remedies suggested. 



"Tapping Experiment* on Para Rubber Trees." Dr. Tronip 

 de Haas. 



Dr. Tromp de Haas explained Hci-ea lapping experiments in 

 Java which were very complete, and advised that tlie largest 

 quantity of rubber was collected from trees that were tapped 

 every day. 



"The Para (Hcvea) India Riiliber Trees in the East." H. A. 

 Wickham. 



Mr. Wickham in his essay objected strongly to close plaining 

 and clean weeding, and brought on an exceedingly spirited dis- 

 cussion by so doing. 



Following the Belgian reception Monsieur M. Wendelen deliv- 



CeyloM and other parts of the East. He suggested new plans for 

 their healtli and comfort. 



"Present Condition of the India Rubber Question in West 

 -Africa" (with photographed illustrations^. M. Auguste 

 Chevalier, explorer, doctor of science, professor in the Paris 

 Museum. 



"The Crude Ruljlicr of Peru." Dr. Emilio Castre, of Peru. 



"Mechanical Preparation of the Rubber in the Factories." 

 -M. Boutarie. 



"Some Notes on (he .Agglutination of Rubber Corpuscles." 

 Hermann C. T. Gardner, F. C. S., M. P. S., analytical and 

 consulting chemist, 45 Caterham road, Lewisham, S. E. 



"The Constituent Parts of Parthciiiuin Argentatum. the 

 Original Guayule Caoutchouc Plant." Dr. Paul Alexander, 



"Mechanical Rubber Tests." Herr Memmler Dipl. Ing. 



"Xotes on Para Ruliber Cultivation." Walter Fox, late 

 .Superintendent Forest and Gardens, S. S. 



"Centrifugalization of Rubber." D. S. Smith, Tobago. 



"Remarks on the Chemical .Analysis of Raw Rubber." 

 J. G. Fol. Chemical Engineer to the Dutch Government. 



