The Mohegan is readily recognised as a type of the Algonquin or (as Mr. Gallatin has recently denominated it,) the 'Lenapee-Algonkin' family, and bears a strong resemblance, both in sound and syntax, to the dialects of some of the existing lake tribes. This affinity is very striking in its grammatical structure, and its primitive words. Derivatives, with all our tribes, are subject to interchange their consonants, or drop them entirely, which creates a necessity of being constantly on the alert to detect these exchanges. Moreover, the accent is uniformly moved, or doubled, often creating primary and secondary accents in the same phrase, which, in an unwritten language, is alone sufficient to account for numerous mutations. But what, more than any other principle, affects the _sound_ of Indian words, in their concrete and derivative states, is the large stock of (so to say) floating particles, which come into these words in the shape of prefixes and suffixes. These are, in their offices, almost as numerous as the purposes of person, tense, number, quality, position, etc., may require. But while their respective office remains precisely the same, in almost any given number of dialects in a mother language, it is found that the several tribes pique themselves in giving these auxiliary particles a sound peculiar to themselves, by which something like _nationality_ is kept up. Thus in two dialects indicating the least change in the primitives or derivatives, to be found among all the tribes, namely, the Chippewa and Ottowa, these particles, which, in the animate class for plural, are denoted by UG, and in the local inflections by ONG, and ING, in the one dialect, are respectively changed to UK, ONK, and INK, in the other. Similar to this process, seems to have been the result of change between the ancient Algonquin and the Mohegan, the latter, like the Ottowa, constantly substituting K for G, and P for B, etc., but in other respects, it exhibits numerous gutturals, and some aspirates, which are but rarely found in the liquid flow of the Algic. It also embraces the (perhaps) Gothic sound of TH, which is wholly unknown (the Shawnee excepted) to the modern lake dialects.