atmospheric electricity, 338.
Bases and acids, their relation in the pile, 927.
Battery, Leyden, that generally used, 291.
_Battery, voltaic_, its nature, 856, 989.
----, _origin of its power_, 878, 989.
----, ---- not in contact, 887, 915,
----, ---- chemical, 879, 916, 919, 1741.
----, ----, oxidation of the zinc, 919, 944.
----, its circulating force, 858, 1120.
----, its local force, 1120.
----, quantity of electricity circulating, 990.
----, intensity of electricity circulating, 990, 993.
----, _intensity of its current_, 909, 994.
----, ---- increased, 905, 989.
----, _its diminution in power_, 1035.
----, ---- _from_ adhesion of fluid, 1003, 1136.
----, ---- ---- peculiar state of metal, 1040.
----, ---- ---- exhaustion of charge, 1042.
----, ---- ---- irregularity of plates, 1045, 1146.
----, use of metallic contact in, 893, 896.
----, _electrolytes essential to it_, 921.
----, ----, why, 858, 923.
----, state of metal and electrolyte before contact, 916.
----, conspiring action of associated affinities, 989.
----, purity of its zinc, 1144.
----, use of amalgamated zinc in, 999.
----, _plates, their_ number, 1151.
----, ---- size, 1154.
----, ---- vicinity, 1148.
----, ---- immersion, 1150.
----, ---- relative age, 1146.
----, ---- foulness, 1145.
----, _excited by_ acid, 880, 926, 1137.
----, ---- alkali, 931, 934, 941.
----, ---- sulphuretted solutions, 943.
----, the acid, its use, 925,
----, acid for, 1128, 1137.
----, nitric acid best for, 1137.
----, construction of, 989, 1001, 1121.
----, with numerous alternations, 989.
----, Hare's, 1123.
----, general remarks on, 1031. 1136.
----, simultaneous decompositions with, 1156.
----, practical results with, 1136.
----, _improved_, 1001, 1006, 1120.
----, ----, its construction, 1124.
----, ----, power, 1125, 1128.
----, ----, advantages, 1132.
----, ----, disadvantages, 1132.
Batteries, voltaic, compared, 1126.
Becquerel, his important secondary results, 745, 784.
Berzelius, his view of combustion, 870, 959.
Biot's theory of electro-chemical decomposition, 486.
Bismuth, its relation to magneto-electric induction, 139.
_Bodies_ classed in relation to the electric current, 823.
---- classed in relation to magnetism, 255.
Bodies electrolyzable, 824.
Bonijol decomposed substances by atmospheric electricity, 336.
Boracic acid a bad conductor, 408.
_Brush, electric_, 1425.
----, produced, 1425.
----, not affected by nature of conductors, 145