"Now I will hold the scuttle up," he went on, "and you shall strike it with this stick. What do you notice?""It gives out a loud ringing sound," said Norah. "Yes," said her brother, "it does, and we say thatcopper is sonorous, which means loud-sounding.
"This is copper wire-some thick, some very thin. What can you tell me by looking at this wire?" "The copper must be ductile," said Norah, "or itcould not be drawn out."
"Quite right again," said Fred, "and it is very tough or tenacious, for we may pull, bend, or twist the wire about almost as we please, and it will not break.""I want now to show Norah this rusty copper nail," said Willie. "See, it is covered with bright green patches. These patches are the rust of copper. Copper rusts very easily, and the rust of copper is poison. It is called verdigris.