Page:Early Man in Britain and His Place in the Tertiary Period.djvu/436

408 the percentage of tin in the bronze articles belonging to the Bronze age is as nearly as possible that which is the best for making a compound for cutting purposes, from ten to twelve per cent. It will be seen from the following table that there is but little variation in the proportions of tin, and not more than might be expected from the rough and inaccurate modes of mixing the metals before the invention of a definite system of weights.