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Wairarapa Times-Age, 19 September 1939, Page 7

"For manv years investigations into the composition of rubber have been going on. and today there are at least four synthetic rivals in the field.” said Dr H. G. Denham, Professor of Chemistry at Canterbury University College, addressing the Geographical Association of Canterbury. “However, there seems little danger of serious competition, except under certain unusual circumstances, such as exist in the U.S.S.R. The main reason for this is that those in charge of the rubber industry have shown themselves possessed of real vision and have spared no" effort to maintain the position of the natural product. As a result of biological research the yield an acre from plantations planted with the best available stock has risen from 4001 b to 12001 b. Every step is being taken to ensure that, in spite of the effect of such factors as the age of the tree, the season of the year, the rainfall and the soil, the biological liquid which flows from the tree is as nearly constant in composition as if it.were made in a chemical factory.”