"When a legislative instrument made by a law-maker with limited powers is challenged, the only function of the court is to determine whether there has been a valid exercise of that limited legislative power in relation to the matter which is the subject of disputed enforcement. If a law-maker has validly exercised his power, the court may give effect to the law validly made. But if the court sees only an invalid law made in excess of the law-maker's power, it has no jurisdiction to modify or adapt the law to bring it within the scope..."
"The application of these principles leads naturally and logically to what has traditionally been regarded as the test of severability."
"... often referred to inelegantly as the 'blue pencil' test. Taking the simplest case of a single legislative instrument containing a number of separate clauses..."