rock-butter

The Russian hunters, on the banks of the Yenisei and the Amour, use a clayey matter which they call rock-butter, as a bait.

Travels to the Equinoctial Regions of America 1851

Russian hunters, on the banks of the Yenisei and the Amour, use a clayey matter which they call rock-butter, as a bait.

Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2 Alexander von Humboldt 1814