In this brochure Mr. Edward M. Bassett deals primarily with the legal phases of zoning, in respect of both the requirements of the law of zoning and its practical application in the New York region. It does not contain any statement of policy regarding the classification of uses and the standards of heights and densities of buildings. These physical aspects of the problem will be a subject for later consideration and treatment. Nor does it deal with the merits of zoning. The principle of zoning has been almost universally accepted as sound when proper methods are employed in its application. This application in a municipality has to be by means of ordinances based on a state enabling act. It is of essential importance that the powers conferred by the state enabling act should be adequate to permit of wise regulation of the uses of land and buildings and of the heights and densities of buildings to be constructed or reconstructed upon the land, and that the ordinances be framed in conformity with the provisions of the enabling act. The purpose of the brochure is to provide helpful information as a guide for action, in the zoning of their areas, by municipal authorities in the New York region.