“It is interesting to notice that in the United States it is now well settled that an executive agency must be rigorously held to the standards by which it professes its actions to be judged and it must scrupulously observe those standards on pain of invalidation of an act in violation of them. Vide the judgment of Mr. Justice Frankfurter in Vitaralli v. Seton (1) This view is of course not based on the equality clause of the United States Constitution and it is evolved as a rule of administrative law. But the principle is the same, namely, that arbitrariness should be eliminated in State action.”