480

Compounds, classification of, by help of

thermal data, 275 et seq.
formulæ of gaseous and

solid, 43, 132, 246

isomorphism of, 65

molecular, 202 et seq., 398
specific heats of, 46, 55

Constitution, water of, 343
Contact-actions, 374, 430

COOKE, J. P., his experiments in con-
nection with physical isomerism, 184
COUPER, his work bearing on valency
of atoms, 118

CROSS, on the action of carbon and
phosphorus on sulphuric acid, 96 note
Cryohydrates, 214, 397

Crystalline form, determination of, as
aid in fixing atomic
weights, 69

salts, dehydration and re-
hydration of, 210, 215,
217, 343

Crystallisation, water of, 210, 343
Cumulative resolution, 383

Divalent, the atom of oxygen is, mean-
ing of expression, 123 et seq.
the atom of tin is, in given
molecule, but is tetravalent
in another molecule, 126
DIVERS, his experiments on the action
of tin, &c., on nitric acid, 103
DONATH, his determination of the spe-
cific heat of uranium oxide, 55
Dualism, opposed by Dumas, 113

opposed to Faraday's electro-
lytic laws, 112

system of, introduced by Ber-
zelius, 110

DULONG and PETIT, their law regard-
ing specific heats of solid elements,
46, 63

DUMAS, his early acceptance of Avo-
gadro's law, 20

his system of notation partly
atomic, partly equivalent, 20
introduces the conception of
types, 113 et seq.

opposes the dualistic system of
Berzelius, 113

Eka-aluminium, eka-boron, and eka-

silicon, 231

Electro-chemical investigations of

Berzelius, 108

Davy, 106

Faraday, 112, 451

Helmholtz, 455

Joule, 452
Thomson, 453

Wright, 454

Electrolysis of acids, 93

water, 100

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,
214

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,

chemical, regarded from
stand-point of equilibrium-
theories, 398

chemical, Wright's experi-
ments in connection with,
378

Iodine, atomic weight of, fixed by help
of periodic law, 238
density of vapour of, 208
Isomerides, formula for finding maxi-

mum number of monad
atoms in molecules of, 139
heat evolved or absorbed in
reactions of, 175 et seq., 303

Isomerism, detailed consideration of,

140 et seq.
exceptions to generally
adopted explanation of, 181