The Sahidic and Bohairic dialects are well defined and separate from each other. Among other distinctive features the Sahidic delights in the multiplication of vowels as compared with the Bohairic; thus it has ⲉⲗⲉⲟⲟⲗⲉ for ⲁⲗⲟⲗⲓ, ⲙⲏⲏⲱⲉ for ⲙⲏⲱ, ϩⲁⲗⲁⲁⲧⲉ for ϩⲁⲗⲁⲧⲓ, ϣⲉⲗⲉⲉⲧ for ϣⲉⲗⲉⲧ, &c. Again the Sahidic has smooth-breathings where the Bohairic has aspirates, e.g. ⲡⲏⲩⲉ for ⲫⲏⲩⲓ “heavens,” ⲧⲏⲩ for ⲑⲏⲟⲩ “wind”; and it substitutes the simple aspirate for the stronger guttural, e.g. ⲱⲛϩ for ⲱⲛⲭ “life,” ⲡⲁϩ for ⲫⲁϧ “rend.” Besides these more general distinctions, the two dialects have special peculiarities, not only in their grammatical forms, but even in their ordinary vocabulary; thus Sah. ⲃⲱⲕ for Boh. ⲓ “to go,” Sah. ϩⲉ for Boh. ⲣⲏϯ “manner,” Sah. ϩⲁϩ for Boh. ⲙⲏϣ “a multitude,” “many,” and so forth. Indeed the relations of the Sahidic and Bohairic dialects to each other may be fairly illustrated, as will have appeared from these facts, by the relation of the Ionic and Attic, though the differences in the Egyptian dialects are greater than in the Greek. Like the Attic, the Bohairic is the more literary and cultivated dialect of the two. The demotic writing does not give the slightest indication that there were different dialects of the spoken language (_see_ Brugsch, Grammaire Démotique, p. 10). In the Coptic, i.e. Christian, literature we learn this fact for the first time; and yet in the earliest age of this literature the dialects are found to be fully developed. Brugsch, however, has shown (De Natura &c., p. 10) that transcriptions of several Egyptian words into Greek in the age of the Ptolemies occur in two different forms, which correspond fairly to the two dialects; and indeed it would seem probable that the separation of the Bohairic and Sahidic should be ascribed to the more remote time, when these regions formed separate kingdoms. The older Egyptian writing, whether sacred or demotic, would obscure the distinction of dialects, partly from a conservative fondness for time-honoured modes of representation, but chiefly owing to the nature of the character itself. Thus this character makes no provision for the nicer distinction of the vowel-sounds, while the dialectic differences depend very largely on the divergent vocalization. Thus again it sometimes represents allied consonants, such as _l_ and _r_, by the same sign; while one of the most striking peculiarities of dialect is the common substitution of _l_ in the dialect of the Fayoum for _r_ in the Sahidic and Bohairic, as e.g. ⲏⲗⲡ for ⲏⲣⲡ “wine,” ⲗⲁⲙⲡⲓ for ⲣⲟⲙⲡⲓ “year,” ⲗⲓⲙⲓ for ⲣⲓⲙⲓ “weeping,” and the like.