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Bearing of this investigation on existence of connection between

molecular structure and molecular energy
Further illustrations of this connection
Illustrations of existence of relations between greater or less

molecular energy and
(1) the actual valencies of the atoms in the molecules con-

sidered

(2) the distribution of reactions between the atoms in the

molecules.

General considerations regarding relations illustrated in pars. 87

and 88.

Application of these considerations to prevalent views on valency
Apparent exceptions to that explanation of isomerism which is

based on the theory of valency
Properties of liquid and solid compounds are to some extent con-

ditioned by mutual molecular actions
Physical isomerism
Work of Lehmann on this subject
Criticism of Lehmann's division of physical isomerides into phy-

sical metamerides and polymerides

Summary of section iv.

Appendix to section iv.

Lossen's criticism of the various meanings assigned to term

valency:

'Are the carbon bonds of equal value?'

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properties of elements.

Relations between atomic weights and atomic volumes

106

107

226

226

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Relations between atomic weights and fusibility of elements.

and various physical constants

of elements

Illustrations of applications of periodic law :

(1) to predict properties of unknown elements

(2) to guide the study of properties of similar elements
* Odd series', 'even series', 'long periods', and 'typical elements'.
Connections between general formulæ of classes of compounds and

atomic weights of elements in these compounds

Forms of highest oxides considered as periodic functions of atomic

weights of the elements

Valency considered as a periodic function of atomic weights of the

elements

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304

306

309

.

318
318

144

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SECTION III. METHODS BASED ON VALUES ASSIGNED TO THE

formula-weight

CONSTANT,

specific-gravity

Explanation of constant considered in this section

150

334

Data to illustrate connections between this constant and composi.

tion of compounds

151 335

Data to illustrate connections between this constant and actual
valencies of atoms in given molecules

152 337
Data to illustrate connections between this constant and distribu-
tion of interatomic actions

153-4
Values of this constant for solid compounds

155 342

Discussion of meaning of constant in question

156 345

SECTION IV. METHOD BASED ON “ETHERIFICATION-VALUES'.

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