The glue is made as follows. Some large perch are skinned, the skins dried and then soaked in a little cold water so that the scales can be scraped off. They take 4 or 5 of the skins, put them in a bladder or wrap them in birch-bark so that the water cannot get to them, and put them to boil in a pan of water. A stone is placed on top so that they cannot move. Using this glue, which never comes unstuck, they whip together the surfaces of the wood in the bow and thus join them.