Darwin's Origin of Species created a considerable controversy at the time of publication. One scientist who disagreed with Darwin was Fleeming Jenkin. His critique of origin of species through natural selection is here quoted at length, since his arguments have never been adequately refuted. Using the work of breeders with pigeons, cattle, horses, dogs, and roses, Jenkin pointed out how through selective breeding the different species of plants and animals will at first demonstrate considerable variability. The rate of variation in a given direction, however, is a constantly diminishing rate, tending to a limit. Darwin attempted to bypass this weakness in his theory by resorting to vast lapses of time. Jenkin insisted that if man through careful manipulation was unable to overcome this natural tendency of species to reach a limit beyond which they show variability, time, no matter how vast, would be equally ineffective. Modern day geneticists have to date not provided the evolutionists with a sound refutation to the objections raised by Jenkin. Even the allopatric theory, i.e., the theory that evolution occurred among small isolated groups, fails to do this.