We shall complete our enumeration of the measuring apparatus by citing Ducretet’s non-oscillating galvanometer, Sir William Thomson’s amperemeters, voltameters, ohmmeters, and mhosmeters, constructed and exhibited by Breguet, and a new aperiodic galvanoscope of Mr. Maiche.  Mr. Baudot exhibited the recent improvements that he has made in his multiplex printing telegraph, and M. Boudet of Paris showed a new system of telephone transmission by submarine cables.

[Illustration:  FIG. 1.—­DIAGRAM EXHIBITING THE ARRANGEMENT FOR TELEPHONIC TRANSMISSIONS WITHOUT A RECEIVER.]

Finally, we shall conclude our enumeration by referring to the curiosities.  The house of Siemens exhibited a miniature electric railway actuated by a new model of Reynier accumulators; M. Maiche operated a system of musical telephonic auditions that differed only in detail from those instituted by Mr. Ader at the exhibition of 1881; and Mr. Hospitalier presented a new form of an experiment devised by Mr. Giltay, consisting of a telephonic transmission of sounds without the use of receivers.  Mr. Giltay’s experiment is nothing but Mr. Dunand’s speaking condenser without the condenser.  A glance at Fig. 1 will show how things are arranged for the experiment.  The transmitting system comprises two distinct circuits, viz.:  (1) one formed of a pile, P, of 2 or 3 Leclanche elements, or of 1 or 2 small sized accumulators, an Ader microphane transmitter, M, and the inducting wire of a small induction coil, B; and (2) the other formed of the induced wire of the coil, B, of a pile, P’, of 10 or 12 Leclanche elements, and of a line whose extremities terminate at R, in two ordinary electro-medical handles.  With this arrangement the experiment performed is as follows:  When any one speaks or sings in front of the transmitter, T, while two persons, A and B, each having one hand gloved, are holding the handles in the ungloved hand, it is only necessary for A to place his gloved hand upon B’s ear, or for the latter to place his hand upon A’s, or for each to place his hand on the other’s ear simultaneously, in order that A or B, or A and B simultaneously, may hear a voice issuing from the glove.  Under these circumstances, Mr. Giltay’s experiment is explained like Dunand’s speaking condenser—­the hand of A and the ear of B here constituting the armature of an elementary condenser in which the glove performs the role of dielectric.

Upon repeating this experiment at the laboratory of the School of Physics and Industrial Chemistry of Paris, it has been found that the glove maybe replaced by a sheet of plain or paraffined paper.  In this case, when two persons are holding the handles, and have their ears applied, one against the other, if a sheet of paper be interposed, airs or words will be heard to proceed therefrom.  Finally, it has been found possible to entirely suppress the paper, or dielectric, and to hear directly, by simply interposing the auditor or auditors in the circuit.  One of