<h3>Annual Session of the German Surgical Society</h3> TWENTY YEARS OF TRANSPLANTATION RESEARCH At the annual session of the German surgical society, held as usual in Berlin the middle of April, the main topic under discussion was Twenty Years of Transplantation Research. Professor Lexer of Freiburg stated that the field of transplantation has been greatly extended. However, homoplasty, operative replacement of lost parts or tissues by similar parts from individuals of the same species, has been frequently unsuccessful. Our endeavor must be to discover the conditions under which homoplastic transplantation can be successful. Bier's articles on regeneration, published a few years ago in the<i>Deutsche medizinische Wochenschrift</i>, emphasized that tissues, to be suitable for transplantation, must regenerate to remedy a gap or defect. The transplantation of whole organs has been disappointing. The regenerative processes may be merely the result of parenteral proteotherapy. Suggestion and resorption may simulate a successful outcome, but
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