A TREE HURTS, TOO

Less a children's book than an illustrated lecture for, say, forest ranger recruits or concerned tree owners. Cross section drawings showing how decay advances and compartmentalizes (with greater or lesser damage to the tree) are accompanied by captions that describe the process thusly: ""When the tree's vigor is low and the wounds are severe the advantage tips toward the invading microorganisms. . . . But the cumulative effects of many minor stress factors over time also tip the balance in favor of the microorganisms."" Dressed up pamphlet material.