Progress in Allergy continues to serve an important role in clinical immunology and allergy by presenting thoughtful reviews of various areas of active research. This year's volume covers a broad range of topics, from methodological problems of immunofluorescence to immunological aspects of platelet damage. Considerable emphasis is placed on the emerging field of cellular immunology, with articles on cellular interactions in the immune response, antigens of the thymus, and lymphocyte mediators. Immunoglobulins continue to receive appropriate attention, in the form of an article on IgA.
The shift of interest from humoral to cellular immunology (or, more properly, the return to the foundations laid by Metchnikoff, as Kallos points out in the "Introduction") is a major transition in the development of immunology. Important as the secreted immunoglobulins are as indicators of immunological reactions, it is at the cellular level that one must seek most of the basis of immunological specificity. The