The literature of the controversy over the bounds of Maryland, so far as it relates to the northern lines, has already been indicated in another volume.[641] The dispute was ably followed by McMahon in his _History of Maryland_ (vol. i. pp. 18-59), among the earlier of the general historians, and the whole question has been surveyed by Johnston in his _History of Cecil County_ (ch. xix.). He traces the course of the Cresap war,[642] the progress of the chancery suit of 1735-1750.[643] The diary of one of the commissioners for running the line in accordance with the decision, being the record of John Watson, is preserved in the library of the Pennsylvania Historical Society. Mr. Johnston (p. 307) also describes the line of 1760,[644] and tells the story of the work and methods adopted by Mason and Dixon in 1763, referring to their daily journal, one copy of which is, or was, preserved in the Land Office, the other in the library of the Maryland Historical Society.[645] The scientific aspects of this famous survey are considered in the _Philosophical Transactions of the Royal Society_ (1769); and a running sketch of the history of the line, by William Darlington, is reprinted in the _Historical Magazine_ (ii. p. 37). Another, by T. Edwards, is in _Harper’s Monthly_ (vol. liii. p. 549), and one by A. T. McGill in the _Princeton Review_ (vol. xxxvii. p. 88). Dunlap’s “Memoir” (see Vol. III. p. 514) is also contained in _Olden Time_ (vol. i. p. 529). The most recent and one of the most careful surveys of the history of the dispute between Baltimore and Penn and of the principles involved is in Walter B. Scaife’s “Boundary Dispute between Maryland and Pennsylvania,” in _Pennsylvania Magazine of History_ (October, 1885, p. 241). Chief among the maps bearing upon the question of the bounds are the following:— _A map of Virginia, Maryland, Pennsylvania, and East and West New Jersey, by John Thornton_, which is without date, but probably from 1695 to 1700.[646] _A new map of Virginia and Maryland and the improved parts of Pennsylvania and New Jersey, revised by I. Senex, 1719._[647] _A short account of the first settlement of the Provinces of Virginia, Maryland, New York, and Pennsylvania by the English, to which is annexed a map of Maryland, according to the bounds mentioned in the charter and also of the adjacent country, anno 1630_, London, 1735. This map is a large folding one called “A map of Virginia, according to Capt. John Smith’s map, published anno 1606; also of the adjacent county, called by the Dutch Niew Nederlant, anno 1630, by John Senex, 1735.”[648] The map accompanying the agreement of July 4, 1760, between Baltimore and Penn, is reproduced, with the text of that document, in the _Pennsylvania Archives_, iv. (1853), p.3.