Section 8
SEC. 8. Every wholesale dealer and every retail dealer in opium shall keep and maintain on the outside of his place of business, so that the same may be seen and easily read by the public, a sign" setting forth in plain, large letters' the name or firm designation of such wholesale dealer or retail dealer, and the words "Licensed wholesale dealer in opium," or "Licensed retail dealer in opium," as the case may be. For a failure to keep and maintain such sign conspicuously displayed as herein provided, or for a violation of any of the provisions of this Act, the Collector of Internal Revenue, or his duly authorized representative, may cancel the license issued to such wholesale dealer or retail dealer, and such wholesale dealer or retail dealer shall not be entitled to the return of any money paid by him for such license.