"Darwinism (1889): An Exposition of the Theory of Natural Selection, with Some of Its Applications" is an outstanding work by Alfred Russel Wallace, an eminent naturalist and biologist. In this book, the author reveals the main aspects of Darwinism and the theory of evolution through natural selection, which he developed together with Charles Darwin. Wallace presents the reader not only with the general principles of this theory, but also gives examples of its application to natural phenomena. His work opens up new horizons for understanding the origin and development of life on Earth and is a must read for anyone interested in biology and science in general.