Includes inset "The Entrance of the River St. John". The elliptical cartouche includes the following text and is typical of DesBarres' navigational notes when present: "The River St. John, has sufficient depth of Water for large Ships to the Falls. Whence it continues Navigable 80 miles up into the Country of Vessels of 100 Tons. At Fort Frederick, common Tides rise 18 feet perpendicular, and Equinoctial Spring Tides 25 Feet, above the Falls, it seldom flows more than 4 Feet. When the Tide has risen 12 Feet, at the Fort, the Falls are Smooth, after which during about 20 Minutes, they are passable. At times of great Freshets, which generally happen between the beginning of April, & the middle of May, from the melting of the Snow, the Falls are absolutely impassable, to Vessels bound up the River, as the Tide does not reach to their Level."
Map of the Boston Harbour after the 1st state of J. F. W. DesBarres map, but in a reduced scale and with additional observations by Chabert. It is notable that it credits DesBarres given the French had sided with the Colonies in the War of Independence and credit was not often documented during this period.
The work of J. F. W. DesBarres, especially the "Atlantic Neptune", was a significant part of Walter's research and interest. The Collection includes 59 charts, views and elevations from the 4 volume set, most from the Sea Coast of Nova Scotia volume.