The Cambridge History of India, Vol. I: Ancient India v1.c15.207

v1.c15.207

But the advancing type does not remain unaffected. Each stage in its progress must always bear traces of the compromise between the new and the old; and, as each recently converted area tends in its turn to carry the change a step farther, the result is that the influence of the progressive language is modified in an increasing degree. Thus is produced a series of varieties, which through the development of their peculiar features become in course of time distinct species differing from the original type and from each other in accordance with their position in the series.