2. Extract from a letter from Baron Humboldt, dated Berlin, January 10, 1838.

"I must be permitted to offer my sincere congratulations to the Geographical Society, at having found so excellent a traveller in Mr. Schomburgk, uniting so much courage with so much devotedness.

His latest labours in Guayana, the ascent of the rivers Berbice and Corentyn, place him very high in my estimation; and the zone of hieroglyphic figures, sculptured in the rock, from Encamarada, in 66 deg. 50 min.

West, to the Eastern houndary of British Guayana, a distance of nearly 600 geographical miles, is an ethnographical fact, which daily increases in interest.

I am much pleased to see the notice taken in your journal of the work of my friend and companion, M. Gustave Rose.

Should I yet publish the detail of my own astronomical observations in Siberia, it will only be in order to fix more accurately the points where I have made observations for terrestrial magnetism.

I bespeak the same indulgence for these labours in Asia, that has formerly been shown to my travels in America.

The admirable trigonometric levelling between the Black Sea and the Caspian is at length finished.

There is depression, but a much less depression than M. Parrot announced after his first barometric levelling by stations.

This always appeared to me probable on account of the elevation of Kasan, and on account of some corresponding observations that I obtained during my journey to the Caspian.

The levelling of M.M. G. Fuss, Sabler, and Savitch, shows that the level of the Caspian is about 105 feet lower than that of the Black Sea.

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