text:  It appears from the same authentic sources of information that the progress of crime during the last twenty years has been much more rapid in the manufacturing and densely peopled than in the simply densely peopled districts; for in Middlesex during the last twenty years population has advanced about fifty per cent and serious crime has increased in nearly the same proportion having swelled from 2480 to 3514: whereas in Lancashire during the same period population has advanced also fifty per cent but serious crime has considerably _more than doubled_ having risen from 1716 to 3987