"Section 1. All articles of commerce and trade offered for sale to the public at retail shall be publicly displayed with appropriated tags or labels to indicate the price of each article and said articles shall be sold uniformity and without discrimination at the stated price: Provided, That lumber dealers are required to tag or label lumber offered for sale to the public by indicating thereon the price and the corresponding official name of the wood so as to enable buyers to distinguish one species of wood from the others: Provided, further, That the Secretary of Commerce and Industry may, upon the recommendation of the Director of Commerce, exempt from time to time certain articles of Commerce and trade or certain classes of establishments from the provisions of this Act. The Secretary of Commerce and Industry is hereby authorized to issue rules and regulations to carry into effect the provisions of this section."