A 1761 map of Fort Detroit that depicts the fort just after it was ceded by the French to British forces, commissioned by Gen. Amherst and hand-drawn by William Brasier, has been acquired by the University of Michigan’s William L. Clements Library.

The map had been in private hands since at least 1967. Because its $42,500 price tag put a substantial dent in the library’s acquisition budget, they’re crowdfunding the purchase—with $20,000 already pledged in matching funds. [Tony Campbell]

Previously: Early Map of Detroit Acquired.

The University of Michigan’s William L. Clements Library has acquired an early hand-drawn map of Detroit—from the period it was a British outpost—that sheds new light on the city’s early history.

A framed 21-by-40-inch map that reveals a plan of the city in 1790 was discovered in a family home in Almonte, Ontario, after the owner contacted historians to check its validity. […]

Historians concluded that the rare, previously unknown hand-drawn, hand-colored map, titled “Rough sketch of the King’s Domain at Detroit,” was indeed an original—drawn on high-quality, watermarked 18th-century paper, and signed by its author, D. W. Smith (Captain David William Smith), dated September 1790.

An exhibition centred on the map is coming in 2017. Detroit News coverage. [WMS]

'Tis the season for Mayflies (Fishflies) to give us something to watch on radar each night as they hatch. #miwx pic.twitter.com/9QxPss2w0g

— NWS Detroit (@NWSDetroit) June 19, 2016

When mayflies “hatch”—that is to say, moult into their final, adult “imago” form—they emerge in truly enormous numbers. Numerous enough to turn up on the National Weather Service’s radar earlier this month. [CBC News]