Abstract
The physico-chemical approach to the understanding and elucidation of a phe nomenon proceeds in three stages.
The first stage consists of the collection of reasonably accurate quantitative data. In the second stage qualitative or rough quantitative explanations of the observed trends are put forward,, and in the final stage the whole phenomenon is made amenable to precise treatment in mathematical terms. The development of dyeing theory passed fairly rapidly through the first and second stages during the 1930's and is now struggling to enter the third stage.
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