Our daily life is no longer cursed by fear of those pestilences, plagues, black deaths, which used to devastate Europe. The layman has abolished those plagues by using the medical expert's knowledge. The medical expert has said in effect, 'There are not many things that we are agreed upon, but at least we are agreed upon this: that though we cannot cure bubonic plague or cholera, we can prevent them, for we know that they are caused by microorganisms transmitted through water and vermin. Keep sewage from your drinking water and vermin from your homes, and you will prevent these plagues.' The layman has seen the point, applied appropriate measures, and these dreadful pestilences have disappeared. Now, if our publics these last twenty years could have grasped certain social truths, not inherently more difficult to understand than the microbic theory of disease, a large part at least of the economic and political pestilences which have come upon us in our generation would not have arisen.

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