ELECTRIC DISCHARGE WITH THE CHLORIDE OP SILVER BATTERY. 235 
Hittorf, W. — Poggend. Annal., cxxxvi., 1869, pp. 1-31, 197-234 ; (Jubelband), 1874, pp. 430-445 ; 
Annal. de Chimie, xvii., 1869, pp. 487-496. 
Morren, C. — Moigno, Cosmos, xiv., 1859, pp. 127-130; Paris, Comptes Rendus, liii., 1861, pp. 794-795 ; 
Compfces Rendus, liv., 1862, pp. 735-737 ; Poggend. Annal., cxv., 1862, pp. 350-352 ; Ann. 
de Cbim., iv., 1864, pp. 325-352. 
Quet. — Paris, Comptes Rendns, xxxv., 1852, pp. 949—952. 
Quet et Seguin. — Comptes Rendus, xlyii., 1858, pp. 964-967 ; Comptes Rendus, xlyiii., 1859, pp. 338- 
341 ; Phil. Mag., xyii., 1859, pp. 109-112 ; Annal. de Cbimie, lxv., 1862, pp. 317-330. 
Reitlinger, E. — Ann. de Cbim., lyii., 1863, p. 114. 
Riess, P. — Phil. Mag., x., 1855, pp. 313-328 ; Phil. Mag., xi., 1856, pp. 524-527 ; Poggend. Annal., 
civ., 1858, 321-323; Ann. de Chim., liv., 1858, pp. 249-250; Pogg. Annal., cx., 1860, pp. 
523-524. 
Robinson, T. R. — Irish Acad. Proc., vi., 1853-54, pp. 282-290 ; Phil. Mag., xvii., 1859, pp. 269-274 ; 
Phil. Trans., 1862, pp. 939-986 ; Chem. Hews, vi., 1862, pp. 259-261. 
Ruhlmann, R., and Wiedemann, G. — Poggend. Annal., cxlv., 1872, pp. 235-259, 364-399. 
Sarasin, E. — Archives Sci. Phys. Hat., xxxiv., 1869, pp. 243-254; Ann. de Chim., xvii., 1869, pp. 
501-502 ; Poggend. Annal., cxl., 1870, pp. 425-434. 
Sarasin, E., and De la Rive, A. — See De la Rive, A., and Sarasin, E. 
Spottiswoode, W. — Roy. Soc. Proc., xxiii., 1874-75, pp. 455-462 ; Roy. Soc. Proc., xxv., 1876-77, 
pp. 73-82, and pp. 547-550 ; Boy. Soc. Proc., xxvi., 1877, pp. 90-93, 323 ; Roy. Inst. Proc., 
viii., 1878, pp. 359-362. 
Spottiswoode, W., with De La Rue, W., and Muller, H. W. — Roy. Soc. Proc., xxiii., 1875, pp. 
356-361. 
Schultz, C. — Poggend. Annal., cxxxv., 1868, pp. 249-260; Ann. de Chim., xvi., 1869, 479-481. 
Varley, C. F.— Roy. Soc, Proc. xix. 1871, pp. 236-241. 
Wiedemann, G., and Ruhlmann, R. — Poggend. Annal., cxlv., 1872, pp. 235-259, 364-399. 
Wiedemann, G. — Poggend. Annal., clviii., 1876, pp. 35-71, 252-286. 
Willingen, V. S. M. VA nder — Ann. de Chim., 1., 1857, p. 126. 
Note B, relating to Page 168. 
Grove (Phil. Trans., 1852, p. 87) makes the following conjecture on this subject in his paper on the 
Electro- Chemical Polarity of Gases : “ Whether gases at all conduct electricity, properly speaking, or 
whether the transmission is not always by the disruptive discharge, the discharge by convection, or 
something clearly analogous, is perhaps a doubtful question ; but I feel strongly convinced that gases do 
not conduct in any similar manner to metals or electrolyte.” 
Becquerel made a most elaborate series of experiments on the “ conductivity ” of gases at high 
temperatures — red heat, and beyond. These are described very fully in the Annales de Chimie, xxxix., 
1853, pp. 355-402, and in abstract in the Comptes Rendus, xxvii., 1853, pp. 20-24. The dis- 
charge was obtained between two concentric cylinders, namely, a strained wire in the axis of a tube, 
both being of platinum ; the tube was capable of being closed at the ends so as to permit experiments at 
any pressure down to about 3 or 4 millims., the limit of his pump. He found that by heating the tube 
to incandescence he could produce a discharge with one cell even at atmospheric pressure, and that the 
current was still further increased if the pressure were diminished. This result applied to all gases, 
pressures and temperatures tried, commencing at incandescence. The order of “ conductivity ” at a red 
heat at atmospheric pressures with one cell was, hydrogen, oxygen, chlorine, j^^rogen } car ^ 0I1 ^ c 
anhydride; but with very high temperatures and small pressures there seemed to be a tendency to 
equal “ conductivity.” 
2 H 2 
