the glass-trade, a term used for a sort of potashes made use of in many of the glass-works, particularly for the green glass. It is the calcined ashes of a plant called by the same name; and in some places, of sea-thongs or laces, a sort of thick-leaved fucus or sea-wrack*. This plant is thrown on the rocks and shores in great abundance, and in the summer months is raked together and dried as hay in the sun and wind, and afterwards burnt to the ashes called kelp.