"Even the widespread resort to shifting cultivation with burning and light hoeing was not as childish as the first European colonialists supposed. That simple form of agriculture was based on a correct evaluation of the soil potential, which was not as great as initially appears from the heavy vegetation; and when the colonialists started upsetting the thin topsoil the result was disastrous. The above remarks show that when an outsider comes into a new ecological system, even if he is more skilled he does not necessarily function as effectively as those who have familiarized themselves with the environment over centuries; and the newcomer is likely to look more ridiculous if he is too arrogant to realize that he has something to learn from the “natives.”"