4, 1473.
----, is affected by the dielectrics, 1455, 1463, 1475.
----, not dependent on current of air, 1440.
----, proves molecular action of dielectric, 1449, 1450.
----, its analysis, 1427, 1433.
----, nature, 1434, 1441, 1447.
----, form, 1428, 1449, 1451.
----, _ramifications_, 1439.
---- ----, their coalescence, 1453.
----, sound, 1426, 1431.
----, requisite intensity for, 1446.
---- has sensible duration, 1437.
---- is intermitting, 1427, 1431, 1451.
----, _light of_, 1444, 1445, 1451.
----, ----, in different gases, 1446, 1454.
----, dark? 1444, 1552.
----, passes into spark, 1448.
----, spark and glow relation of, 1533, 1539, 1542.
----, in gases, 1454, 1463, 1476.
----, oxygen, 1457, 1476.
----, nitrogen, 1458, 1476.
----, hydrogen, 1459, 1476.
----, coal-gas, 1460, 1476.
----, carbonic acid gas, 1461, 1476.
----, muriatic acid gas, 1462, 1476.
----, rare air, 1451, 1455, 1474.
----, oil of turpentine, 1452.
----, positive, 1455, 1467, 1484.
----, _negative_, 1468, 1472, 1484.
----, ----, of rapid recurrence, 1468, 1491.
----, positive and negative in different gases, 1455, 1475, 1506.

_Capacity, specific inductive_, 1252.
----. _See_ Specific inductive capacity.
_Carbonic acid gas_ facilitates formation of spark, 1463.
----, brush in, 1461, 1476.
----, glow in, 1534.
----, spark in, 1422, 1463.
----, _positive and negative_ brush in, 1476.
----, ---- discharge in, 1546.
----, non-interference of, 645, 652.
Carbonic oxide gas, interference of, 645, 652.
_Carrying discharge_, 1562.
----. _See_ Discharge convective.
Cathode described, 663, 824.
_Cations_, or cathions, described, 665, 824.
----, table of, 817.
----, direction of their transfer, 962.
Cations, are in relation through the entire circuit, 963.
_Characters of_ electricity, table of, 360.
---- the electric current, constant, 1618, 1627.
---- voltaic electricity, 268.
---- ordinary electricity, 284.
---- magneto-electricity, 343.
---- thermo-electricity, 349.
---- animal electricity, 351.
_Charge_, free, 1684.
---- is always induction, 1171, 1177, 1300, 1682.
---- on surface of conductors: why, 1301.
----. _influence of_ form on, 1302.
----, ---- distance on, 1303.
----, loss of, by convection, 1569.
----, removed from good insulators, 1203.
---- of matter, absolute, 1169.
---- _of air_, 1173.
---- ---- by brush, 1434, 1441.
---- ---- by glow, 1526, 1537, 1543.
---- of particles in air, 1564.
---- of oil of turpentine, 11