The Tacit Dimension consists of the Terry Lectures delivered at Yale University in 1962 under the heading, Man in Thought. A scientist-philosopher who has taught at the Universities of Oxford, Manchester, Yale and Chicago and was a Senior Fellow at the Center of Advanced Study at Wesleyan University in 1965-66, Michael Polanyi bases his thesis on the premise that we can know more than we can tell. He explores the significance of the tacit dimension in creative thought, in particular in scientific inquiry. He points to an inescapable need for a traditional framework in which the operative belief is that the facts and values of science are built on a still unrevealed reality. His book makes an intellectual demand upon the reader.