<P> To Thomsen the find circumstances were the key to dating . In 1821 he wrote in a letter to fellow prehistorian Schröder: </P> <P> nothing is more important than to point out that hitherto we have not paid enough attention to what was found together . </P> <P> and in 1822: </P> <P> we still do not know enough about most of the antiquities either;...only future archaeologists may be able to decide, but they will never be able to do so if they do not observe what things are found together and our collections are not brought to a greater degree of perfection . </P>

How did they make tools in the iron age