A thoroughgoing introduction to the phenomena of the ice ages and their recent coming to light through the studies of such men as Agassiz and Charpentier adds another title to the growing list of science books by Gerald Ames and Rose Wyler. Beginning with a graphic account of the discovery of a preserved mammoth in ? Siberia in 1799, the account moves on to the fascinating observations and deductions made by the Swiss scientists- among them the cyclical tipping of the Earth's exis which brings periodical cold spells and, once started, how the temperature drops obey meteorological laws to help multiply glacial deposits in mountainous and polar areas. The life these ice flows covered is also examined in comments on creature periods, migration waves, cave paintings and the other relics ice age man left to posterity. A successful study that is also a note on the temporality of earthly existence.