Guapo with his knife first scraped all the bark, as well as the Alburnum or white coating, from the rods, which last he flung away.
"Popular Adventure Tales"
Mayne Reid
The mixture of bark and Alburnum was next placed upon a smooth stone, and mashed into a fibre of a yellowish colour.
"Popular Adventure Tales"
Mayne Reid
Sap and Heartwood Wood is composed of duramen or heartwood, and Alburnum or sapwood, and when dry consists approximately of 49 per cent by weight of carbon, 6 per cent of hydrogen, 44 per cent of oxygen, and 1 per cent of ash, which is fairly uniform for all species.
"Seasoning of Wood"
Joseph B. Wagner