It has been known for years that many biological processses are electric in nature. Thus for instances, muscular electricity is generated when a muscle is flexed. This effect can be accurately neasured and recorded. That electricity is biologically produced is best illustrated by the electric eel which can generate several hundreds volts of electric current. Considering that many imporant chapters in the development of Electricity is deeply related with the evolution of the biological sciences it is utterly important a brief historical and scientific overview in order to be acquainted with the fast advancements of the electro medicine started in the second part of XIX century.