Stopping power of substances with reference to alpha rays, 219.
Struggle for existence, dynamic basis of, 80.
Strutt, Prof. the Hon. R. J., age of geological periods, 20;
radioactivity of zircon, 223.
Sub-Apennine series of Italy, 148.
Suess, nature of earthquakes. 143.
Survival of the fittest and the organic law, 80.
T.
Talchir boulder-bed, 136.
Temperature gradient in Earth's crust, 126.
Termier, section of the Pelvoux Massif, 254.