For a decade, we have admired the incisive and broadly informed works of Ladislav Tondl on the foundations of science. Now it is indeed a pleasure to include this book among the Boston Studies in the Philosophy of Science. We hope that it will help to deepen the collaborative scholar- ship of scientists and philosophers in Czechoslovakia with the English- reading scholars of the world. Professor Ladislav Tondl was born in 1924, and completed his higher education at the Charles University iIi Prague. His doctorate was granted by the Institute of Information Theory and Automation. He was a...