"[T]he types of substances... made when metals dissolve in [sulfuric] acids...are called s. In the olden language they were called s. ...Here I have some beautiful crystals of copper sulfate ...blue vitriol. ...Here... iron sulfate... iron [or green] vitriol, which is the first sulfate... that they made the... sulfuric acid from, and... some crystals of white vitriol... . ...But I want to show you a most interesting [clear] mineral ...extremely beautiful. ...This comes out of the ground ...[A]lmost everyone ...would have lots of this in your houses. ...The mineral is called . The chemical name is ...[from which] we make plaster. ...Once again sulfur playing a key role in our everyday lives."