Invisible before restoration. Without writing and drawings.

Formerly 360 r.a; 285 x 221 mm; transparent paper, ruled columns spaced 32 mm apart. A stroke of the pen highlights the initial statement, which affirms the persistence of impressions in sensible bodies. There follows a series of examples: the sound of bells; the voice in the human ear, which allows the various sounds to be compared and their consonance perceived; the image of the sun in the eye; the luminous circle produced by whirling a burning brand; the threads of rain — to conclude that the motion of bodies is due to the persistence of the impression, or force impressed by the mover. This gives to understand that the aforesaid examples were subordinated to this conclusion, which, however, although underlined with a stroke of the pen, is as if submerged in the ample exemplification that continues, touching on impressions in fluids, air and water, finally remaining interrupted and suspended.