... purpose: that of suggesting the forms of prooftogether with the ways in which they may be used; that of helping the speaker to test the strength of hisarguments; and that of enabling the speaker ... also advantage us in that they exhibit the unity of progress, the solidarity of the race, and the continuity of history. Authors lead us back along the pathway of law, of liberty or religion, ... hundred miles away, and the pollen of the one carried upon the trade winds to the branches of the other. We see the tree with its strange system of water−works, pumping the sap up through pipes...