Mark Twain passage of boat, was a measure on the sounding line. Twain is an archaic term for "two", as in "The veil of the temple was rent in twain." The riverboatman's cry was "mark twain" or, more fully, "by the mark twain", meaning "according to the mark [on the line], [the depth is] two [fathoms]", that is, "The water is deep and it is safe to pass." Twain said that his famous pen name was not entirely his invention. In "Life on the Mississippi", he wrote: Captain Isaiah Sellers was not of literary turn or capacity, but he used to jot
Old English idiom and vocabulary were best preserved in the dialect of Somerset. For details of the sound differences between the dialects, see Phonological history of Old English (dialects). The language of the Anglo-Saxon settlers appears not to have been significantly affected by the native British Celtic languages which it largely displaced. The number of Celtic loanwords introduced into the language is very small. However, various suggestions have been made concerning possible influence that Celtic may have had on developments in English syntax in the post-Old English period, such as the regular progressive construction and analytic word order, as well as the