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The sudden burst of interest in the thymus during the last five years more than justifies the appearance of a monograph on those aspects of its function which bear particularly on immunity and the processes associated with the development of malignant disease. Of those who are actively working in the field I believe that Dr. DONALD METCALF is uniquely suited to produce such a work. His demonstration of a lymphocytosis stimulating factor from thymic tissue in 1956 was almost the first evidence of physiological activity by the thymus. He has played an important part in the analysis of the...

This book is something which almost accidentally has developed very differently from how it was initially planned. The intention was to elaborate the part played by the immune system in ageing with the role of the thymus as central theme. It was to be essentially an expansion of a lecture I gave in 1970 and would inevitably have been concerned with much the same material as Walford's book, The Immunologic Theory of Aging, though from a different slant. What changed its character arose from a series of attempts to find logical connection between two findings that most gerontologists regard as...

In 1957 or thereabouts I became impressed with how immunity could be looked at as a process of Darwinian selection amongst the circulating lymphoid cells of the body. The clonal selection theory which grew out of this has been generally accepted in principle by immunologists, but I do not feel that its full implications in relation to pathology have yet been widely realized. In a previous book, Immunological Surveillance, I have tried to apply the approach to cancer immunity. This is a basically similar attempt to look at auto-immune disease from the same Darwinian point of view. Anyone who...