Introduction, by O. Bastiansen.

A facsimile of the original paper of Cato Maximilian Guldberg and Peter Waage, presented by Waage at the Norwegian Academy of Science and Letters on March the 11th 1864 [entitled: Studier over affiniteten, in Norwegian]

Cato Maximilian Guldberg and Peter Waage, by H. Haraldsen.

Guldberg and Waage and the law of mass action, by E.W. Lund and O. Hassel.

Some features of chemical kinetics, by J.A. Christiansen.

An invesitgation of slow and rapid coagulation of hydrosols by means of a flow ultramicroscope, by B.V. Derjaguin and M. Koudryavtseva.

Guldberg and Waage's law in the gravitational field, by H. Wergeland.

Steady states and variational principles, by I. Prigogine.

Absolute reaction rate theory and the law of mass action, by H. Eyring and S.H. Lin.

Application of the mass-action law on ionic equilibria in fused salt mixtures, by J. Toguri, H. Flood and T. Førland.

The energy of transargononic bonds, by L. Pauling.

Notes on molecular geometry and chemical reactivity in connection with the B 12 vitamins, by D.C. Hodgkin.

Atomic arrangement in compounds or complexes containing chemical bonds of the charge-transfer type, by O. Hassel.

Plutonium metal, by W.H. Zachariasen.