In his book Darwinism (1889), Wallace had used the term pure-Darwinism which proposed a "greater efficacy" for natural selection .   George Romanes dubbed this view as "Wallaceism", noting that in contrast to Darwin, this position was advocating a "pure theory of natural selection to the exclusion of any supplementary theory."   Taking influence from Darwin, Romanes was a proponent of both natural selection and the inheritance of acquired characteristics . The latter was denied by Wallace who was a strict selectionist.  Romanes' definition of Darwinism conformed directly with Darwin's views and was contrasted with Wallace's definition of the term. 
In the early 1800s, most people, scientists included, accepted as fact that every species was specially created by God in a form that never changed. The epic voyages and revolutionary insights of two brave young British naturalists, Charles Darwin and Alfred Russel Wallace, overturned this long-held idea. Prodigious collectors of animals and plants, each man developed a keen appreciation for the variation within species, the relatedness of species, and the patterns of geographic distribution—evidence that was hard to reconcile with special creation. This hard-earned knowledge led each to ask why and how creatures came to live in a given place.