Science and International Co-operation.

The article looks at some general trends that are observable during the first half of the twentieth century. Nearly all scientific research was done in the universities. The decline of international science before the first world war is described. From 1919 to 1934 there was a fifteen year period in which science was unhampered by national boundaries, in which many great advances were made and in which cooperation of all kinds flourished so well that this was not a subject for special comment. This was the period that American science began to mature.