
doi: 10.1086/464084
1. For the purposes of comparative linguistics and for the reconstruction of the prehistory of peoples, it is not sufficient merely to know that a given group of languages are or are not related to each other. French is related to Spanish and it is related to Russian, but there is a tremendous difference of degree. Spanish and French are both modern forms of Latin, the end products of 2000 years of divergent drift. But the common period of the Romance languages and Russian dates back perhaps 5000
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