The detailed examination of comparatively small regions, which has been the subject of the preceding chapters, may have tended to obscure or at least to have pushed into the background the broad differences that exist between north and south China, the dividing line of which is marked by the Tsinling. We must return, therefore, to these differences which have been noted by all geographers who have written on China, notably George B. Cressey and L. Dudley Stamp, both of whom have emphasized the contrast by detailed tabulation.