The problems and possibilities of interdisciplinarity are explored in this essay from the perspective of a favorably-disposed agnostic. It is argued that a piecemeal, step-by-step approach may prove more effective in helping to promote the necessary changes in attitude and practice than a radically proselytizing one. Some of the main hindrances - both social and cognitive - to interdisciplinary development are reviewed before noting that. at the micro-level of individual specialisms, a number of relevant activities already occur. Though there remain significant barriers to progress, an encouraging area of common concern can be identified on which to base a systematic move towards greater intellectual unity.