=Constitutional Protection Against Special Legislation.=--To protect the cities against special legislation and at the same time to remove the opportunity which such a practice offers for bribery and the employment of other improper means to secure special legislation or to prevent it, when it is not desired, the constitutions of many states contain provisions absolutely prohibiting the legislature from enacting laws applying to particular cities except where general laws are inapplicable. Where such constitutional provisions have been adopted, the legislatures have frequently evaded them by a system of classification by which acts are passed applying to all cities within a class when in reality there may be but a single city in such a class. And the courts have generally held such acts to be constitutional where the classifications are not unreasonable. The New York constitution recognizes that special legislation applying to larger cities may sometimes be desirable, and instead of forbidding such legislation absolutely it classifies the cities of the state into three classes according to population,--New York City, Buffalo, and Rochester constituting the first class,--and allows the legislature to enact laws affecting a single city within a class, subject to the condition that the proposed law must be submitted to the authorities of the city affected, for their approval, and if disapproved it is void unless repassed by the legislature. Likewise by recent amendment to the constitution of Illinois the legislature of the state is allowed to pass special laws affecting the city of Chicago alone, but such legislation cannot take effect until it has been approved by the voters of the city at a general or special election.