. The pruning-book; a monograph of the pruning and training of plants as applied to American conditions. f stubthan on the time of year. Dressings for wounds.—Having now obtaineda general conception of the nature of the healingprocess, we are prepared to understand that adressing for a wood wound must possess twoproperties,—it must check the weathering of thewound, and it must prevent the growth of bac-teria and fungi; and it must also be of such anature as not to injure the cambium and other words, the ideal dressing is a protectivecompound and an antiseptic. It does not hastenthe hea
. The pruning-book; a monograph of the pruning and training of plants as applied to American conditions. f stubthan on the time of year. Dressings for wounds.—Having now obtaineda general conception of the nature of the healingprocess, we are prepared to understand that adressing for a wood wound must possess twoproperties,—it must check the weathering of thewound, and it must prevent the growth of bac-teria and fungi; and it must also be of such anature as not to injure the cambium and other words, the ideal dressing is a protectivecompound and an antiseptic. It does not hastenthe healing process, except as it prevents is preservative and preventive. It follows from the above considerations thatthe first thing to be sought in a wound dressingis durability. Paint and tar answer this require-ment. It should also have intimate contact withthe wood. Wax and shellac do not satisfy thisrequirement, for they tend to peel off and tocrack. Lead paint and tar are antiseptics, whereaswax, shellac, tallow and the like, are not. Bor-deaux mixture is ^.Iso an almost perfect anti-. DRESSINGS FOR WOUNDS 111 septic, and if it had the power of persisting andof preventing checking or weathering, it w^ouldbe an ideal wound dressing. On quick-healingwounds it can be used with great satisfaction, aswe shall discover later ; and it is a question if itwould not pay to thoroughly spray trees, fromwhich many small limbs have been cut, with themixture. This advice has other recommendationsthan its suggestion for the preserving of wounds,for Bordeaux mixture is an excellent general fun-gicide; it cleans the trunks and branches of lichenor moss; and it probably exerts the same in-fluence as the w^ashing of trees in softening thebark and preventing the parts from becomingbark-bound (see page 78). Paint and tar are the dressings most universallyrecommended. Tar and coal-tar are popular withforesters, but it is certain that they often injurethe cambium and bark of fruit trees
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