ABSTRACT
Examples of coexistence are always within reach. There is no need for laboratory experiments or apparatus. Anyone may study the subject on his way to work, with no further guides than his own common sense and his own internal harmony. In one working day, from the time he gets up until he goes to bed, a man may often test the theory of coexistence and apply the formula. If either seem to be true, the result will be the more convincing because it will have been true of ordinary occurrences of daily life, the popular and practical things which everyone knows. Here are some of the communities to which a business-man may belong in a day.
