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My paper this evening will be chiefly concerned with problems relating to chemical data and to data which relate to subjects on the fringe of chemical science. This is largely because it is the principal field in which I work and, additionally, because I feel with Donker Duyvis that ‘there is some naïvety in the belief that to any individual or collectivity the really scientific scheme of classification is possible’. In other words, we ought, perhaps, to put one house in order before we prescribe a detailed and complete scheme of order for the whole universe.