Ninth Exception.-It is not defamation to make an imputation on the character of another, provided that the imputation be made in good faith for the protection of the interest of the person making it, or of any other person, or for the public good. Illustrations (a) A, a shopkeeper, says to B, who manages his business-"Sell nothing to Z unless he pays you ready money, for I have no opinion of his honesty.” A is within the exception, if he has made this imputation on Z in good faith for the protection of his own interests. (b) A, a Magistrate, in making a report to his own superior officer, casts an imputation on the character of Z. Here, if the imputation is made in good faith, and for the public good, A is within the exception.