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of the different rates of speed of currents from the surface of the water to the bottom                   of the different cross slants between the surface and the bottom                 of the different currents on the surface of the waters                 of the different currents on the bed of the rivers                 of the different depths of the rivers                 of the different shapes of the hills covered by the waters                  of the different shapes of the hills uncovered by the waters                 where the water is swift at the bottom and not above                     where the water is slow at the bottom and swift above                  where it is slow below and above and swift in the middle                   where the water in the rivers stretches itself out and where it contracts                  where it bends and where it straightens itself                   of the different slants in the descents of the water

 

from Leonardo da Vinci’s notebooks*