1) Frog “prepared in the usual way” for the experiment with the “electrostatic machine” and with the “Leyden jar”.

2) Galvani’s “atmospheric discharge detector”: the half frog, with the crural nerves connected to the lightning-conductor and the muscles connected to the water of the well, acts as a “coherer antelitteram”, a detector of electromagnetic waves emitted by the lightning.

3) Details of frogs “prepared in the usual way” for the experiments and of the metallic arcs used to produce contractions.

4) Details of Galvani’s laboratory.