Element, the old conception of, 1, 248
Elements, atomic heats of, 56
atomic weights of, data for finding, tables, 37 et seq., 78 et seq.
atomic weights of, table, 45 atomic volumes, curve of, 226 atoms of, have definite re- placing values, 117
atoms of, valency of (see also
valency of atoms), 121 classification of, by help of thermal data, 274
classification of, in accord-
ance with their atomic heats, 56
classification of, in accord- ance with the periodic law, 224 fusibility of, 228 isomorphism of, 67 periodic connection between atomic weights and pro- perties of, 223 et seq. specific heats of, law of Du- long and Petit regarding,46 specific heats of some, deter- mined indirectly, 51 et seq. specific heats of, table, 48 study of properties of, by help of the periodic law, 233 unknown, properties of, pre- dicted by the periodic law, 230
Elementary gases, table of molecular weights of, 31
Endothermic and exothermic changes, meaning and application of terms, 254, 446
methods of determin- ing, 350
FARADAY, his electro-chemical investi- gations, 112, 451, 455
FISCHER, his work in connection with the atomic theory, 7 Fluorine, specific heat of, 52
Forms of oxides and salts as determined by application of the periodic law, 243 Formulae, chemical, of gases compared with those of solids, 43, 462 chemical, structural, examples of methods of obtaining, 144 et seq.
chemical, structural, general- isations usually made in obtaining, 151 et seq. chemical, structural, regarded from kinetical point of view, 466
FRANKLAND recognises a substituting value for each elementary atom, 117,
Fusibility of elements, connection be- tween, and atomic weights, 228
Gallium, identical with eka-aluminium, 231
GARNIER and CANNIZZARO, their gene-
ralisation regarding specific heats of compounds, 47, 55
Gases, formulæ of, compared with those of solids, 43, 462
GAY-LUSSAC, Berzelius modifies the law of, 17
Dalton refuses to accept
the law of, 12
his law regarding volu-
metric combinations of gases, 12
GEOFFREY, his tables of affinity, 401 GERHARDT, his law of even numbers, 76, 200
his reasons for changing
the equivalents of carbon, &c., 21
GIBBS, his investigation of the equili brium of heterogeneous systems, 394
GLADSTONE, his investigations on chemi- cal change, 398
GLADSTONE and DALE, their investiga- tions on refraction-equivalents of carbon-compounds, 307 et seq. GLADSTONE and TRIBE, their investiga- tions in connection with the electro- lysis of acids, 93
GMELIN, his system of notation, 20 GOLDSTEIN, his investigations on the
connection between boiling points and molecular structure, 305
GRAHAM, his work on colloidal and crystalloidal matter, 216, 398 note
his work on water of crystal- lisation, 343
GROTH, his investigations regarding morphotropic relations, 170
Group, use of term in nomenclature of the periodic law, 224 GULDBERG and WAAGE,
their theory of chemical affinity, 407
et seq. their theory of chemical affinity ap- plied by Ostwald, 416 et seq. their theory of chemical change, 373 GUTHRIE, his work on cryohydrates,
Halogens, hydracids and oxyacids of, considered thermally, 279 HARCOURT and ESSON, their investiga- tion of conditions of chemical change, 399 HARTLEY, his investigation of relations of molecular structure to absorption- spectra, 331 Heat, connection between quantities of, evolved in chemical changes,
his thermodynamical con- siderations regarding chemical change, 446 his use of the terms free and bound energy, 446 HERMANN, R., his work in connection with specific heats, 47
HICKS, his treatment of dissociation- phenomena, 393
HOFF, J. H. VAN'T, his hypothesis re- garding optically active compounds, 323 et seq.
HOOD, his experiments on the influence of temperature on the rate of chemical change, 391 note
HORSTMANN, his treatment of dissocia- tion-phenomena, 361, 393
Hydration and dehydration of salts, 210, 215, 217, 343
Hydrofluoric acid, density of vapour of,
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