Bull. U. S. B. F., 1917-ii 



Plate XL. 



Fig. I. — The chums, with buttons receiving polish by the use of acid and steam. Note the funnels from which acid solution 



drips into the churns. (See p. 77.) 



Fig. 2. — The sorting room, in which skillful operators classify buttons into 40 grades. (Sec p. 77.) 



