...of Euclid v. Ambler Realty Co., 272 US. 365 (1926). "The ordinance . . . and all similar laws . . . must find their justification in some aspect of the...power, asserted for the public welfare. The line which . . . separates the legitimate from the illegitimate assumption of power is not capable of precise...

...Bettman's analogy to public nuisance law as the justification for comprehensive zoning regulations: The line which in this field separates the legitimate...assumption of power is not capable of precise delimitation. . . . 1n solving doubts, the maxim "sic utere tuo ut alienum non laedas," which lies at the foundation...

...to the new conditions, are found clearly not to conform to the Constitution, of course, must fall. The ordinance now under review and all similar laws...some aspect of the police power, asserted for the publie welfare. The line which in this field separates the legitimate from the illegitimate assumption...

...OF USE REGULATION After asserting that the ordinance under review and all similar laws must find a justification in some aspect of the police power asserted for the public welfare, the court takes up the question of that part of the ordinance which controls the use of buildings and says...

...zoning power may operate: Restrictions upon the free use of private land must find their justifications in "some aspect of the police power, asserted for the public welfare" ; the legitimacy of any particular restriction must be judged with reference to all of the surrounding circumstances...