. Conservation. Forests and forestry. 53^ CONSERVATION cement is put in and tamped into place; and after it has set sufficiently, it is shaped in such a manner as to preserve the contour of the tree, and permit the bark to heal entirely over it. In some cases the extra precaution is taken of placing a zinc cap over the cement, fit- ting it inside the edges of the bark. The thoroughness of this method is at once apparent, and the thousands of trees which have been thus treated bear which, though less expensive, was only a temporary makeshift, quickly corrod- ing and tearing loose from the tree
. Conservation. Forests and forestry. 53^ CONSERVATION cement is put in and tamped into place; and after it has set sufficiently, it is shaped in such a manner as to preserve the contour of the tree, and permit the bark to heal entirely over it. In some cases the extra precaution is taken of placing a zinc cap over the cement, fit- ting it inside the edges of the bark. The thoroughness of this method is at once apparent, and the thousands of trees which have been thus treated bear which, though less expensive, was only a temporary makeshift, quickly corrod- ing and tearing loose from the tree as it swayed in the wind, and leaving the cavity open and unprotected as before. Think of a dentist simply placing a piece of tin over an unfilled cavity in a tooth! It was once thought impossible to render the filling of a cavity perma- nent and effective; this idea was based. THE RESULT OF NEGLECT Weak, Unsupported Crotches Are Dangerous. Loss of Branch Destroys Symmetry and Beauty of Tree eloquent testimony to its effectiveness. How striking, then, is the analogy be- tween this method of treating a cavity and the modern system of dentistry; both are based on the same three prin- ciples ; the decayed matter must be en- tirely removed; the cavity must be pre- pared in such a manner that the filling will stay permanently in place; and moisture and all foreign substances must be absolutely excluded. This method is a striking improvement over the antiquated system of merely clean- ing out a cavity superficially, and tack- ing over the outside a piece of tin, on the supposition that the growth of a tree was on the inside, and that in consequence the cement would event- ually be forced out. But as a matter of fact there is absolutely no growth on the inside of a tree, which acts as a physical support. The entire growth takes place immediately under the bark, and if the filling is properly put in, so that it is entirely inside the growing tissues, the bark will heal completely over
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