The perspective emerging from this comparison shows at least four unique theories (Matthew, early Darwin, mature Darwin and Wallace), each interesting in its own right. Each theory integrated change in conditions, variability, competition and natural selection in ways that allowed for species transformation somehow. Apart from this similarity, the theories differ significantly from each other in the mechanisms underlying transformation. However, this difference does not lie in the struggle for survival and survival of the fittest, but in the way in which natural selection is integrated with variability, competition and environmental conditions. Transmutation is a convergent result of structurally different mechanisms.