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These consisted in completing the removal of the Montezuma aqueduct , building a few bridges and power-plants , removing washed-in material , laying wash wall , cutting off projecting points and other miscellaneous work . When the crowd at last halted , he flitted feverishly from point to point around its outer rim , hunting a place to get through ; and at last , after a deal of difficulty and delay , succeeded . Maybe we should reconsider the appropriateness of certain Whiteheadian concepts and principles , such as the role of eternal objects and of the ontological principle within the system . That objection aside , Cahill spans centuries of history beautifully and seamlessly , giving readers a lovingly painted picture of the high Middle Ages and how its sensibilities evolved to shape ours today . However , time and experience are great teachers in both venues and can , I believe , lead to very accurate interpretations .