Finally, in reference to the hypothesis of a unique determination
of matter after eternal duration in the past, it may not be out
of place to remind the reader of the complexity which modern
research ascribes to the structure of the atom.

302

INDEX

A.

Abney, Sir Wm., on sensitisers, 210.

Abundance of life, numerical, 98-100.

Adaptation and aggressiveness of the organism, 80.

Additive law, the, with reference to alpha rays, 220.

Age of Earth, comparison of denudative and radioactive methods of
finding, 23-29.

Aletsch glacier, 286.