In 1859, Robert Kennicott set off on an expedition to collect natural history specimens in what is now the Mackenzie River and Yukon River valleys and in the Arctic tundra beyond. Kenicott became popular with Hudson's Bay Company fur traders in the area and encouraged them to collect and send natural history specimens and First Nations artifacts to the Smithsonian. In 1865 the Western Union Telegraph Expedition was mounted to find a possible route for a telegraph line between North America and Russia by way of the Bering Sea. Kennicott was the chief scientist for this expedition and the party of naturalists sent to assist him included W.H. Dall. Kennicott died of a heart attack while travelling up the Yukon River. However, Kennicott's efforts brought what is now the Yukon to the world's attention.