No more than six ounces of cotton shall be taken from any bale of cotton under the pretext of sampling the same; but after the sale of the cotton and after the weight thereof has been ascertained and agreed upon, the buyer may take from the bale, at his own loss, six ounces more of cotton for comparison with the sample by which he bought. Any person violating any of the provisions of this section shall be guilty of a misdemeanor; and, in prosecutions under this section, the ownership of the cotton need not be alleged or proved.