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Late in the afternoon I motored out to the gap with Covington west of town some 6 miles. Here we saw many small rubber trees growing often on red clay hills the soil of which was badly furrowed & washed away by rains owing to clearing of grass & weeds. On the roadside we saw a durian tree with its intercalate fruit growing on the terminal branches. In speaking of gibbons Robinson said that some species were dimorphic, the brown ones being conspecific with the black & that they sometimes changed from brown to black or inversely