or, 975.
_Sulphur_ determined to either pole, 552, 681, 757.
----, its conducting power, 1241, 1245.
----, its specific inductive capacity, 1275.
----, copper and iron, circle, 943.
_Sulphuret of_ carbon, interference of, 650.
---- silver, hot, conducts well, 433.
Sulphuretted solution excites the pile, 943.
_Sulphuric acid_, conduction by, 409, 681.
----, magneto-electric induction on, 200, 213.
---- in voltaic pile, its use, 925.
---- not an electrolyte, 681.
----, its transference, 525.
----, its decomposition, 681, 757.
Sulphurous acid, its decomposition, 755.
_Summary of_ conditions of conduction, 443.
---- molecular inductive theory, 1669.

_Table of_ discharge in gases, 1388.
---- electric effects, 360.
---- electro-chemical equivalents, 847.
---- electrolytes affected by fusion, 402.
---- insulation in gases, 1388.
---- ions, anions, and cathions, 847.
Tartaric acid, nature of its electrolysis, 775.
_Tension_, inductive, how represented, 1370.
---- of voltaic electricity, 268.
---- of common electricity, 285.
---- of thermo-electricity, 349.
---- of magneto-electricity, 343.
---- of animal electricity, 352.
---- of zinc and electrolyte in the voltaic pile, 949.
Terrestrial electric currents, 187.
_Terrestrial magneto-electric induction_, 140.
---- cause of aurora borealis, 192.
----, _electric currents produced by_, 141, 150.
----, ----, _in helices_ alone, 148.
----, ----, ---- with iron, 141, 146.
----, ----, ---- with a magnet, 147.
----, ---- a single wire, 170.
----, ---- a revolving plate, 149.
----, ---- a revolving ball, 160.
----, ---- the earth, 173.
Test between magnetic and magneto-electric action, 215, 243.
_Theory of_ combination of gases by clean platina, 619, 626, 630, 656.
---- electro-chemical decomposition, 477, 661, 1623, 1704.
---- the voltaic apparatus, 875, 1741.
---- static induction, 1165, 1231, 1295, 1666, 1667.
---- disruptive discharge, 1368, 1406, 1434.
---- Arago's phenomena, 120.
_Thermo-electricity_, its general characters, 349.
---- identical with other electricities, 360.
----, its evolution of heat, 349.
----, magnetic, force, 349.
----, physiological effects, 349.
----, spark, 349.
Time, 59, 68, 124, 1248, 1328, 1346, 1418, 1431, 1436, 1439, 1612, 1641,
1730.
_Tin_, iodide of, electrolysed, 804.
----, protochloride, electrolysis of, definite, 789, 819.
_Torpedo_, nature of its electric discharge, 359.
----, its enormous amount of electric force, 359.