I give a revision (“reload”) of an earlier paper on logico-empiricism’s philosophy of biology by checking its central theses against the background of the international conferences of Prague (1934), Paris (1935), and Copenhagen (1936), so important for the development of logical empiricism and its spread in the western world. My theses are that logical empiricism did not contribute in the same way to the development of philosophy of biology, as it did e.g. to the development of philosophy of mathematics or (...) physics. The reasons for this failure were: (1) logical empiricists were unexperienced in biological science. (2) They concentrated on an unproductive ('ideological') framework (anti-vitalism, reduction) that they took to be philosophy of biology. (3) This prevented them from dealing with actual problems of biological science. Between the various sections of the paper, I insert “intermezzos” that present several conference participants in a wider historical context (Great War, persecution, language). (shrink)