It shall be unlawful for any person, firm, or corporation or officer thereof or agent or employee of such person, firm, or corporation who is engaged in business as a junk dealer to enter upon the lands of another person, without the written consent of the owner or tenant in possession of such land, for the purpose of buying junk, or soliciting for the purpose of buying junk, or, after entering upon such land, to purchase or offer to purchase junk in any manner whatsoever.