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A Fine Pre-Lewis & Clark Map of Canada and the Transmississippi West.

Scarce map of Canada and the Transmississippi West, extending west to the Rocky Mountains and the MacKenzier River.

The map is based upon Aaron Arrowmsmith's monumental 1804 map of North America, the same map which Lewis & Clark carried with them on their expedition to the Pacific Ocean.

Perhaps the most interesting feature is the depiction of the headwaters of the Missouri River. Here, the map incorporates the reports of Peter Fidler for the Hudson's Bay Company, by including a series of possible river courses to the west, leading to (and prospectively through) the Rocky Mountains. It was this section of the map that provided the best depiction of the prospect of a water route or portage through the Rocky Mountains and to the Pacific.

It was this information derived from Peter Fidler and incorporated by Arrowsmith, along with reports from local Indians encountered on the expedition, which Lewis & Clark relied in choosing their path to the Rocky Mountains.

The map includes additional annotations of note, including a reference to the Indian report that once the Rocky Mountains were crossed, it was an 8 day trip to the Pacific and the reference to the Pearl Shell Lake on the eastern slope of the Rocky Mountains in the general vicinity of Denver, Colorado.

The details in Canada are also quite exceptional for such a small map, making use of the reports of Hearne, MacKenzie, and the Hudson Bay Company.

Russian factories are noted on the Alaskan coastline, with extensive Indian tribal information in the interior.

Excellent detail on the Pacific Coast, including a reference to the mythical "Riv. Oregan".

We have been unable to determine the source of the map, but it is quite similar to a map published by Longman, Hurst, Rees and Orme, which credits Arrowsmith.

Aaron Arrowsmith Biography

Aaron Arrowsmith (1750-1823) was born in Durham in 1750. He came to London for work around 1770, where he found employment as a surveyor for the city’s mapmakers. By 1790, he had set up his own shop which specialized in general charts. Arrowsmith’s three shops were located on or near Soho Square, a neighborhood the led him to rub shoulders with the likes of Joseph Banks, the naturalist, and Matthew Flinders, the hydrographer. Through his business ties and employment at the HO, Arrowsmith made other important relationships with Alexander Dalrymple, the HBC, and other companies. In 1810 he became Hydrographer to the Prince of Wales and, in 1820, Hydrographer to the King. He died in 1823, whereby the business passed to his sons, Aaron and Samuel, and, later, his nephew, John.