We exist in the geographical environment, moving about in space-time, as we carry on our continual intercourse with nature, through breathing, drinking, eating, absorbing light, heat and other forms of radiant energy, eliminating through breathing, urination and defecation, through the skin and by radiation of heat, as the geographical environment flows in and out of us, as it does in all other organisms.

p. 37 as cited in: Laura Thompson (1961) Toward a science of mankind. p. 84 - Nature and human nature (1951)