It consists of an open system of theories from the geological and biological sciences (adapted from the title page of Julian Huxley's book of 1942 wherein the term "evolutionary biology" was introduced).
Finally, in February 2009, Pope Benedict XVI made the euphoric "Darwin-birthday-statements" quoted in the introduction of this Essay, claiming that Darwin's system of theories is compatible with Christian faith.
Traditional Chinese medicine (TCM) has developed a system of theories and practices since at least 2,000 years ago and remains popular in some Far East Asian areas.
Due to this steady growth of our "Tree of modern evolutionary knowledge", the scientific discipline of evolutionary biology has been defined as a "system of theories" that explains the various aspects of those processes that Charles Darwin described as "descent with slight and successive modifications" [ 6, 7].
Before explaining my use of the term brain, let me begin by briefly describing the three (or four) progressive systems of theory and practice defined in the framework.
The framework maps the field as a continuum of progressively more challenging systems of theory and practice, which yield increasingly more complete degrees of self-regulation based on increasingly more profound levels of mind/brain integration.
In a chapter called "Humans Behaving Badly," Dr. Farley writes admiringly of the reward-and-punishment system of behaviorist theory.
He did not formulate a complete system of economic theory, as did Smith in his Wealth of Nations, but Hume introduced several of the new ideas around which the "classical economics" of the 18th century was built.
Berzelius's new nomenclature and notation were prominently displayed in his 1819 Essai, which presented a coherent, compelling system of chemical theory backed by a vast body of analytical results that rested on improved, highly precise laboratory methods.
