. Teacher's handbook of Slöjd . Fir. Narrow layers, Broad layers, hard resinous loose fibred timber. Oak. Narrow layers, Broad layers,loose fibred hard timber,porous timber. Vessels op Air-tubes. When a cross-section of a stem is carefully examined anumber of minute holes or pores are seen. These are themouths of vessels or air-tubes, which penetrate the wholesubstance of the wood, parallel with the fibres. Their func-tion is to enable the air to circulate in the stem, and they Theporous-are found even in wood of the closest grain, rendering it ^^^^^^porous. Vessels are most numerous
. Teacher's handbook of Slöjd . Fir. Narrow layers, Broad layers, hard resinous loose fibred timber. Oak. Narrow layers, Broad layers,loose fibred hard timber,porous timber. Vessels op Air-tubes. When a cross-section of a stem is carefully examined anumber of minute holes or pores are seen. These are themouths of vessels or air-tubes, which penetrate the wholesubstance of the wood, parallel with the fibres. Their func-tion is to enable the air to circulate in the stem, and they Theporous-are found even in wood of the closest grain, rendering it ^^^^^^porous. Vessels are most numerous in the wood formedearly in spring, and very few are found in autumn wood, acircumstance which helps to make the annual layers moredistinct. According to the size of these vessels wood is saidto be fine or coarse-grained. Each kind of tree has something peculiar to itself in themanner of distribution, the number, and the size of itsvessels. They are most marked in the oak, the ash, and theelm, giving to the wood of these trees, when seen in vertical S2 HANDBOOK OF SLOJD. Resin. section, its striped or str
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