Ordovician Chazyan Classification in Vermont

Abstract

The inner bark and cambial zones of black spruce were studied. The percentages of "protein" varied from 0.3 in the mature wood to 1.65 in the very young sapwood, and from 3.85 in the inner bark to 7 in the cambial zone. The amt. in the alcohol-insoluble part of the cambial zone was 19.2%. Crystalline sucrose (33% on a dry basis) was obtained from the cambial zone. It was also found in large amts. in the inner bark. The cambial zone was low in pento-sans, lignin, and methoxyl. These substances were present in large amts. in the outer bark, sapwood, and heartwood. The benzene extract of the inner bark and cambial zone contained a white solid which may be a glycoside, and also a yellowish oil. Pectic materials occurred in large amts. in the inner bark where they were mixed with starch. Hemicellu-loses were isolated from the inner bark and sapwood. In general, hemicelluloses in mature wood contained 1 ether-linked methoxyl group for each uronic acid group. Those from the inner bark appeared to have less than 1 methoxyl for each uronic acid group.