Differences of opinion become evident when it is claimed that living things reached their present structure by natural selection. That improved kinds are formed by struggle through natural selection is not supported by modern findings. Influence of the doctrine of natural selection has been illustrated by behavior of industrialists and militarists, who have reasoned that, if evolution was accomplished by selfish initiative at the expense of other living things, it is easy to justify the same conduct now. It is dangerous to believe that man is the product of struggle among selfish, irresponsible lower organisms.