ABSTRACT
There was a renaissance of interest in cellular immunology from 1942 through 1952. In 1942, Coons (Chapter 13, Figure 1a) perfected immunofluorescence to demonstrate antigens and antibodies in cells1. That same year, Landsteiner and Chase (Chapter 2, Figures 39 and 42) reported the transfer of delayed-type hypersensitivity with lymphoid cells but not with serum2.
