In many parts of England, hedges are an important part of the countryside. (A hedge is a kind of fence made of bushes or tree.) An English botanist, Max Hooper, studies the English hedges and discovered some interesting fact about them. First, he determined that the older the hedge, the more species of bushe and tree it contained. second, he concluded that a hedge usually starts with one species and gains a species with each century. Using this rule, which became khown as "Hooper's Rule," people have studies hedge in England and discovered that many of them are very old. Quite a few of them have more than ten species, which means that they