These decayed brownish fragments, now sometimes hardly recognisable as glass but originally pale green, were made in the glass-houses operating in the forests of northern Europe. In England the principal centre of manufacture was the Weald, where these may well have been made, although they might equally be French in origin.

The forms shown here are a jug, several goblets and beakers (centre) and examples of the glass flasks used in medicine (right). In medieval medicine samples of urine were examined by doctors in such flasks; they would diagnose according to its colour.