A Lamarckian Experiment Involving a Hundred Generations with Negative Results

The experiment was devised to find out whether regeneration of the dorsal branch of the second antenna of Simocephalus and Daphnia , repeated for many generations, would result in an improvement in the regeneration (which is very imperfect) or in any other alteration in the process. Neither the character nor extent of the regeneration was influenced in any measurable degree in any of the experimental lines, even after 100 generations, nor was the normal growth of the antenna affected. A similar experiment, except that selection was practised in addition, likewise produced negative results, confirming both the lack of the Lamarckian effect and the inefficacy of intraclonal selection.