Statistics for occurrence #1 of “Mr. Usher” in chapter 19 of Medford Historical Society Papers, Volume 22.:

... the k, which in time was superfluous to the c which the English had introduced. (Note also Merrimack—Merrimac.) The ancient maps show it as Mistick and Medford river, but as late as 1885 Mr. Usher felt called upon to state, on page 18, History of Medford, More probably the fact that the current in this stream flows sometimes in one direction, and sometimes in the opposite, may have seemed...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.