. Wood and forest . eaf trees havethe power of putting out at any time adventitious buds which maydevelop into branches. When a branch dies, the annual layer ofwood no longer grows upon it, but the successive layers of wood on jjlj WK^^M- ^jB^ m^jj^ s ^s^^ ^H W^^m^*- i ■n K ^M mT-i^^^i ^E^^l ^Hj^^H^H **K^^ I^V- -K xt>i1^ H^^^H i^F ~ ^ ^$%^^^ ^^^1 HH|H[vj#^ w ;^-Syi^3s S^ HH b^!^-^^- ^M W^m^^i!^u ^i^^^^M^BkM ^^PP^ ■H HBn|8^^/^J^|iUaR^ j^^^^l H ■^^^ Sff^ ^1 ^H)^^ HM i^^if/%1. --1 B p^^P ^jf|| ^1 mL-, ll^^^^ ^^KE^^ ^^1 **^^,g-^ M M 7^-1 Fig. 31. Bni-l on White Oak. 38 WOOD AND FOREST. the
. Wood and forest . eaf trees havethe power of putting out at any time adventitious buds which maydevelop into branches. When a branch dies, the annual layer ofwood no longer grows upon it, but the successive layers of wood on jjlj WK^^M- ^jB^ m^jj^ s ^s^^ ^H W^^m^*- i ■n K ^M mT-i^^^i ^E^^l ^Hj^^H^H **K^^ I^V- -K xt>i1^ H^^^H i^F ~ ^ ^$%^^^ ^^^1 HH|H[vj#^ w ;^-Syi^3s S^ HH b^!^-^^- ^M W^m^^i!^u ^i^^^^M^BkM ^^PP^ ■H HBn|8^^/^J^|iUaR^ j^^^^l H ■^^^ Sff^ ^1 ^H)^^ HM i^^if/%1. --1 B p^^P ^jf|| ^1 mL-, ll^^^^ ^^KE^^ ^^1 **^^,g-^ M M 7^-1 Fig. 31. Bni-l on White Oak. 38 WOOD AND FOREST. the trunk itself close tigiiter and tighter around it, until it is brokenoff. Then, unless it has begun to decay, it is successivel)- overgrownb] annual layers, so that no sign of it appears until the trunk is cutopen. A lai-ge trunk perfectly clean of branches on the outside mayhave many knots around its center, remnants of branches which grewthere in its .youth, as in Fig. 34, and Fig. 8, p. 18. The general ef-. Fig. 32- Fornieii b\- Pilli Ra\sill Oak (full size). FiL^ 33. Swofl Gum, Shdwiiig-UnevenDeposit (if Coloring Matter (fuU size.) feet of the presence of a knot is, that the fihcis that grow ai-ound andover it are bent, and this, of course, produces crooked grain. Following are the designations given to different knots by lumber-men: A sound knot is one which is solid across its face and is ashard as tlie wood surrounding it and fixed in position. A /))() knotis sound, but not over % in diameter. A standard knot is sound THE STKUCTUKE OF WOOD. 39 but not over I3// in diameter. A Jarge knot is sound, and over 1>4in diameter. A spilce knot is one sawn in a lengthwise position. Adead, or, loose knot is one not firml) held in place \>y growth orposition. (4) Pith. At thecenter or axis of thetree is the pith ormedulla, Fig. 34. Inevery bud, that is, atthe apex of everj stemand branch, the pith isthe growing part; butas the stem lengthensand becomes overgrow
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforests, bookyear1912
