Abstract
SUMMARYIn a recent publication, Muller has listed those families whose pollen can be recognized in the fossil record. Those recorded as being in existence before the Palaeocene have an average advancement index which is significantly lower than that of the present‐day world flora, while those which appeared only after the Oligocene have a significantly higher one. Statistical analysis shows that many primitive characters are more abundant in the early arrivals than in the present‐day world flora. Muller's data, therefore, provide strong support for the concept of an advancement index calculated on the basis of statistically correlated characters.
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