240 
MESSRS. W. DE LA RUE AND H. W. MULLER ON THE 
PAGE. 
Heat developed at strata .. .. .. .. 1 74, 10, 13 ; 179, 35, 37 ; 187, 85; 199, 167 
„ ,, in a non-lnminons entity 178, 32 ; 182, 45, 47 ; 185, 77 ; 186, 78 ; 189, 97 ; 196, 152 
Hittorf 163, 178, 188, 236, 237 
Introduction of gas during discharge, effect of . . . . 219, 227 ; 220, 227 ; 221, 227 
Mascart . . . . . . . . . . . . . . . . . . . . . . . 155 
Maximum pressure in Hydrogen, 25,000 M, permitting discharge with 8,040 cells . . 198, 161 
Minimum 
„ 46,053 M, „ 
„ 11 M, 
„ 3 m, „ 
McLeod 
Mercury vapour from pumps present in tubes 
Morren 
Motion, proper motion, of strata towards positive 
11,000 
8,040 
11,000 
214 
. . 187 note 
. . 187 note 
159, 173 
194, 139, 140 ; 216, 221, and note 
188 
175, 18; 183, 60; 185, 66, 67; 189, 101; 
197, 157; 201, 177; 205, 196; 217, 222 
„ „ „ „ negative 173, 4, 8, 9; 175, 21; 177, 28; 182, 47; 186, 78 
Negative, suppression of stratification by enclosing that terminal in a tube of small diameter 
221, 227; 237 
,, „ „ when that terminal fills the bore of the tube . . . . 237 
,, terminal, extent of glow on, dependent on strength of current . . . . . . 208,20/a 
Origin of strata at positive pole . . 173, 9 ; 179, 35, 37 ; 182, 46 ; 185, 77 ; 186, 78, 79 ; 187, 86 ; 
18 9,98, 99; 192, 115, 116; 193, 124, 126; 198, 167; 210, 203 
Palladium hydride . . . . . . . . . . . . . . . . . . . . 222, 228 
Phosphorescence 
Photographs of stratification first obtained August 3rd, 1875 
„ “ arch ” discharge 
Plucker 
Pulsation of current when strata perfectly steady, shown by induction-coil and galvanometer 
184, 62; 227-229 
, 188, 92 
207, 200 
183 note 
178 
,, „ on advent or retreat of a stratum 
Quet . . 
Radial impulse from negative . . . . 
Resistance, effect of introduction of, on strata 
“ Resistance ” of vacuum-tubes, measurement of , . 
„ „ effect of bore on . . 
„ ,, during discharge 183 ,58,59,60, 
211 
&c.) 177, 27 , 
Ruhlmann 
Ruhmkorff . . 
Sarasin 
Schultz 
Sensitiveness of discharge to external influence (approach of finge 
194, 138, 139; 202, 183; 204, 191 
Seguin 
Shifting terminal (Spottiswoode) 
Spectra of strata and of glow on terminals 177, 29 ; 178, 33 ; 179, 34, 37 ; 180, 40, 42, 43; 182, 45 
50, 52, 54; 183, 59; 185, 62; 184, 66, 67, 72; 186, 78, 84; 189, 100 , 
194, 132, 139, 140; 195, 144, 149; 215, 218; 216, 220, 221. 
telephone . . . . . . . . 230 
. . 229 
. . 177, 184, 211 
221, 227; 237 
211, 204, and note; 212, 205-207 
160-171 
159 
184, 63; 186, 77, 79, 81, 82, 83; 
188, 93; 190, 105 
236 
155, 177, 188 
188 
164 
178, 29; 179, 35; 
218, 225; 219, 226 
177 
. . 164 ; 210, 203 
