Galvani had made in 1790 his historic observations on the muscular contraction produced in the bodies of recently killed frogs when an electrical machine was being worked in the same room, and described them in 1791 (De viribus electricitatis in motu musculari commentarius, Bologna, 1791).
Borelli (De motu animalium, Rome, 1680), explained that birds are enabled to grasp the twig on which they rest whilst sleeping, without having to make any muscular exertion, because the weight of the body bends the knee and ankle-joints, over both of which pass the tendons of this compound muscle.
If the budget be not sanctioned by the emperor, that of the previous year remains in force, and the government has power, motu proprio, to impose the extra taxes necessary to carry out new laws.
His best-known work is De motu animalium (Rome, 1680-1681), in which he sought to explain the movements of the animal body on mechanical principles; he thus ranks as the founder of the iatrophysical school.
His publications include: Disquisitio mathematica in causam physicam figurae et magnitudinis terrae (Milan, 1751); Saggio della morale filosofia (Lugano, 1 753); Nova electricitatis theoria (Milan, 1 755); Dissertatio de motu diurno terrae (Pisa, 1758); Dissertationes variae (2 vols.