Elementary Magic is a text on magic by Ebenezar McCoy.
Elementary Magic was written in a textbook format and is the first book most wizards hand to their apprentices as it dealt with the nuts and bolts of magic. It teaches how to move energy around and stresses the need for control and responsibility by the wizard.
It is one those rare exceptions to other books and texts written on magic, because it addresses magic in its most elementary sense: as a source of energy. Other texts were generally filled with confusing opinion and philosophy.