From the October 24, 1931, issue

GLACIERS CAUSED GEOLOGICAL MOVING DAYS

Evolution, not revolution is a nice-sounding catchword used on all sorts of occasions by all sorts of people, especially by conservative politicians posing as liberals. But a broad view of the evolutionary stage, recorded by a leading scientist who has just left it, indicates that evolution has often proceeded by great jumps, and that these waves of change, both in the species of animals and in their distributions, were responses to geological revolutions in the uneasy old earth itself.