In "On The Origin of Species", Darwin presents what he has observed occurring in nature and writes about the theory he has come up with from his observations - the theory of evolution. In his concluding paragraph, he sums up his story of evolution by saying that all things living today "have all been produced by laws acting around us. These laws...being Growth with Reproduction...Variability...and as a consequence to Natural Selection...Thus, from the war of nature, from famine and death, the most exalted object which we are capable of conceiving, namely, the production of the higher animals, directly follows." (2) What Darwin discusses, then, are the patterns and laws that govern the evolution of animals in a physiological representation of variation.