He opened his library and house to me freely; and I have to notice his continued interest since my coming here.

In the letter which has just reached me, he encloses a favorable notice of my recent _Narrative of the Expedition to the Sources of the Mississippi_, from Sir Humphrey Davy.

If there were nothing else, in such a notice from such a source but the stimulus it gives to exertion, that alone is worth to a man in my position "pearls and diamonds." Colonel Brady, who is active in daily perambulating the woods, to make himself acquainted with the environs, seeking, at the same time, the best places of finding wood and timber, for the purposes of his command, brought me a twig of the Sorbus Americana, a new species of tree to him, in the American forest, of which he asked me the name.

This tree is found in occasional groups extensively in the region of the upper Lake latitudes, where it is called the mountain ash.

In the expedition to the sources of the Mississippi in 1820, it was observed on the southern shores of Lake Superior, which are on the average a little north of latitude 36 deg.