The rubber tree book . s usually of a bluish-white colour, but, on occasion, is 3ellow and sometimes almostblack. \Miile the latex of very young trees contains a slightlyhigher proportion of resins than that of more mature trees,the rubber from young trees has practically the same composi-tion as rubber from old trees when tested by chemical does not mean that the one rubber is equal in quality tothe other. The chemical analysis of many products is thesame, although the articles are very widely different. Glucoseand malt extract, for example, have the same chemical com-position,
The rubber tree book . s usually of a bluish-white colour, but, on occasion, is 3ellow and sometimes almostblack. \Miile the latex of very young trees contains a slightlyhigher proportion of resins than that of more mature trees,the rubber from young trees has practically the same composi-tion as rubber from old trees when tested by chemical does not mean that the one rubber is equal in quality tothe other. The chemical analysis of many products is thesame, although the articles are very widely different. Glucoseand malt extract, for example, have the same chemical com-position, but malt extract is a very different thing from glucoseand can convert starches into sugars while glucose leaves themuntouched. To take a case more common: the cellulose ofwood pulp has the same chemical composition as the celluloseof cotton, but nothing like the same tensile strength. The factis that chemical analysis, while helpful, cannot be relied uponas a final test. With rubber the final test is vulcanization. It. Fig. 31.—Carrier Cart conveying Coagulated Latex from OutlyingPortion of Estate to Factory.
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Keywords: ., bookcentury1900, bookdecade1910, bookidrubbertreebo, bookyear1913
