An excellent bit of evidence on the subject of the group-soul is the fact, often chronicled but not explained, that when telephone or telegraph lines are built in new countries the birds fly against the wires and are killed by thousands, the first season. But when the next season's birds are hatched they are wise and avoid the wires! If the group-soul were not a fact in nature it would naturally require a long time for wire education. No such sudden adjustment would be possible. Reincarnation represents continuous evolution with no waste of time or loss of energy. Death is not the sudden break in the life program that the popular belief pictures it. The common view of death is as erroneous as the common view of birth. If death were what most people believe it to be it would constitute a blunder of nature--an irrational interruption of orderly development. In nature's economy there is conservation of energy and no loss can arise through the change called death. If the popular belief that at death we go far away to a totally different kind of existence were sound then death would usually mean an enormous waste. A young man is educated for some particular work, engineering, architecture or statecraft, and graduates only perhaps to die soon afterward. All that time and energy spent in getting such an education would be largely lost either if death ends all, or is the last he will know of the material world. But nature does not thus blunder. Her law of conservation is always operative. All the skill and wisdom acquired will be brought back in rebirth and will be used in the future incarnations. A child in school is a fair analogy for a soul in evolution. The child cannot get an education in a term nor in a year. He must return often to the same school, after the rest of regular vacations. He may use new books with higher lessons but he returns periodically to the same environment. Continuous attendance would be as unthinkable as finishing his education in a single term. In evolution the soul returns periodically to the physical world, or plane, for the same reasons. Continuous life here until all material experience is gained would be impossible. Aside from the need of the double process of acquiring and digesting experience the physical body would become a hindrance to evolution. Within certain limits the physical brain can respond to the requirements of the growing soul, but a new body is in time an absolute necessity to further evolution.