It may be seen, then, that if one was prepared to accept the existence of insulating sheaths on the nerves, all the arguments raised against the proposed identification of the nervous and electrical fluids, except one, could be answered satisfactorily. The single exception involved the question of how an electrical disturbance in the brain could be confined to a single nerve, and, as was indicated earlier, it was scarcely fair to hold this sort of objection against the electrical theory alone. (...) In that case, there remained no convincing argument to show why one should not accept the identification of the two fluids. On the other hand, of course, it remained an open question as to whether there was any convincing argument to show why one should accept the identification either. Galvani thought that his experiments provided just such an argument. (shrink)

The invention of the first source of electric current by Alessandro Volta, an account of which he communicated in two letters to Sir Joseph Banks in London in 1800, was the outcome of nine years' experimentation. When material was being collected for the Edizione Nazionale of Volta's works , the Secretary of the Dutch Academy of Science discovered some correspondence between Volta and van Marum. The letters dated from 1788 to 1795, and two of them, written in 1792, reported some (...) experiments in which the elements which were later to make up his Couronne de tasses and the Pile were constructed. The question that could be asked is: ‘Why did Volta take so long to do the simple operation of connecting these elements in series to form his Artificial electric organ?’. This is the enigma, and I propose in this paper a possible solution to it. (shrink)