Contemporary Topics in Immunobiology

This second volume of Contemporary Topics in Immunobiology considers many aspects of thymus dependency in order to exemplify the role of the thy­ mus in different species and different immunological responses. It is not in­ tended to be a compendium of the responses which have been shown to be thymus dependent but rather to illustrate for the reader the criteria he should apply in thinking about the significance of the thymus in immune responses. We are grateful to the editors and publishers of