444 Dr. G. Gore on the Influence of Proximity 



wire electrodes '072 inch diameter, all cut from the same 

 piece, not amalgamated, fixed in paraffined corks, and con- 



nected in series by means of silk-covered copper wire '022 

 inch diameter. The tubes were held together in a single row 

 by means of two horizontal bars of soft wood having grooves 

 on their inner opposed surfaces ; they were arranged so as to 

 slide to and fro through a space of If inches, into and out 

 of leaden tubes 7 8 inch long and ^ inch thick, so as to 

 obtain the simultaneous effects of approach and recession of 

 the two sets of electrodes into and out of the influencing 

 substance on each side of the apparatus. The influence of 

 the lead tubes was reinforced by that of removable strips or 

 bars of lead in contact with them above and beneath. The 

 tubes and electrodes were constantly screened from daylight. 

 The apparatus was designed so that the electrodes and the 

 lead might be brought very much nearer together than in the 

 previous one. Its greatly increased compactness considerably 

 and sufficiently diminished the disturbance caused by difference 

 of temperature of its different parts. The electrolyte was that 

 used in the previous apparatus ; its advantages were that it 

 did not give rise to formation of insoluble salts or bubbles of 

 gas upon the electrodes. The same galvanometer was used 

 as in the previous experiments ; an ordinary astatic one of 

 1000 ohms resistance was not sufficiently sensitive. The two 

 series of electrodes were respectively denominated " A " and 

 " B." With this apparatus numerous experiments were made. 



1st Series of Experiments. 



With strips of sheet lead "25 inch thick and one inch wide 

 in contact above and below with the lead tubes. The " A " 

 electrodes happened to be feebly volta positive to the " B " 

 ones. — Ninety-seven observations were taken during the 



