Abstract
ROBB1 claimed that evolutionary changes in the horse's facial index (face-length/cranium-length) could be explained on the basis of a single law of relative growth of the face against the cranium, acting through mutations affecting solely an increase in general size. His argument is supported by a graph of face-length plotted against total skull-length for a number of fossil and modern horses, which on superficial examination seems to show that the two sets of points for phylogenetic and ontogenetic growth fall on a common straight line. Robb concludes: “One hundred million years of facial evolution may be summed up in the expression— slope = 0.66”, but points out that a logarithmic equation would also express the size relation between face and cranium.
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