Staining reagents can also be used to differentiate lignified cell-walls.
It is hardly possible to differentiate between imported and indigenous plants.
Besides the shortness of the period these variables possess other characteristics which differentiate them from the long-period variables.
Thus the first months of the war served to differentiate the two belligerents.
For the 18th century the only calendars are the Home Office Papers and the Treasury Books and Papers, the further specialization of government having made it necessary to differentiate domestic state papers into several classes.