49_a._ No re-distribution took place unless the outside conductor was connected to earth or to a conductor of large capacity, nor would an outside conductor, which was already charged, serve to exhibit the sensitive state. The re-distribution effect was proved by means of a telephone connected in circuit between the outside conductor and the earth Fig. 5, p. 17. When the state was sensitive, that is, during the use of the air-gap, the telephone produced a sound in unison with the intermissions occurring at the air-gap. § 9 and 9_a_. 50. REITLINGER AND URBANITZKY’S EXPERIMENT. SENSITIVE STATE ILLUSTRATED BY A FLEXIBLE CONDUCTOR WITHIN THE DISCHARGE TUBE. _Proc. Vienna Acad._, 1879. _Nature_, Nov. 20, 1879.—The discharge tube was 20 cm. long. It had the usual platinum electrodes, and it stood upright. From the upper electrode, was suspended a strip of tinfoil in the middle of the tube, which was connected to a pump so that the density of the gas could be varied. At atmospheric pressure, the secondary current of a Ruhmkorff coil connected to the electrodes caused the strip to be attracted to the glass tube. The attraction was less and less as the process of exhaustion was carried on, and when a pressure indicated by 7 mm. was reached, the strip was neither attracted nor repelled, but hung downward the same as without any electricity whatever, but it was _attracted_ by a neighboring shell-lac rod which had been rubbed with cloth, and it was _repelled_ by a glass rod which had been rubbed with amalgam, it being assumed that the strip was connected to the anode. § 36. The opposite action took place when it was connected to the cathode. As the exhaustion continued and became greater and greater, these actions died away also up to a rarefaction of about 4 mm. Independently of the degree of rarefaction, the flexible strip of tinfoil was always deflected by an outside conductor connected to earth. § 49.