The leaders must show convincingly that the laws which they have discovered may be applied to daily life, but the _individual himself_ must adopt them. When he has been saturated with knowledge, his inertia will break down, his hopelessness give way to its very antithesis, a strong hope for a better future. Every known method must be used by the laboratory to develop this hope into a belief wide enough to reach all members of every section of the community and deep enough to become a vital working principle. Only through a belief strong enough to ride over unbelief and inertia, a belief in the value of science for personal life strong enough to make a wise choice possible, can the will to obtain a better environment be developed. The belief in better things must be thoroughly impressed on the individual mind. Each individual must understand that it does affect _him_, that it is _his_ concern, that _he_ must give heed to his environment. Then he may have the will and make the effort to combat dangers to body and mind. Today, belief is much more difficult than ever before because the dangers are unseen and insidious, and our enemies do not generally make an appeal through the senses of sight and hearing. But the dangers to modern life are no less than in the days of the pioneers, when a stockade was built as a defense from the Indians. We have no standards for safety. Our enemies are no longer Indians and wild animals. Those were the days of big things. Today is the day of the infinitely little. To see our cruelest enemies, we must use the microscope. Of all our dangers, that of uncleanness leads--uncleanness of food and water and air--uncleanness due to unsanitary production and storage, to exposure to street dust, or to cooking and serving of food in unclean vessels. Such conditions result not only in actual disease, but in lowered vitality and lessened work power. Lack of knowledge on the part of some, heedlessness on the part of others who should be intelligent enough to interpret such conditions, are responsible for their continuance. A few timely suggestions will accomplish more in remedying many evils than any amount of attempted legal enforcement. The very fact of a law makes many persons defy it. They feel justified in showing their wit by outwitting the law’s representatives. Many of our newer citizens have come to us from the protection (?) of a personal authority that they can see and feel. In this country of ours, we have taken away that binding regard for authority, and we must as far as possible lead rather than compel. It is, after all, what a man determines for himself and for his family that affects both his views of life and his wish to secure for himself and for them that which he believes to be best. It is not what some other man believes for him that affects his life.