For over two thousand years scholars have worked to organize and classify all the various fields, disciplines, studies and powers of humanity. One of the best studies, based on the work of St. Thomas Aquinas, was reduced to a wonderful graphical representation – known as the Tree of Virtues – by the Carmelites of Salamanca in the 1600s. Now, four centuries later, the Tree is updated to include the various new branches of sciences and arts which have arisen. This book provides a review of over a dozen treatments of the Tree, complete details on the Salamanca Tree, and a revision incorporating most of the branches of modern sciences.