After briefly describing the conceptions of the HL-A antigens and of histocompatibility, the authors give an account of their own retrospective examinations in connection with keratoplasty. Transplantations between identical groups of the ABO-system have a greater probability of ending successfully, if at least 2 HL-A antigens of donor and recipient are identical; this being chiefly important when grafting is carried out into unfavourable, vascularized surroundings.
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