The First Six Books of the Elements of Euclid - In Which Coloured Diagrams and Symbols Are Used Instead of Letters for the Greater Ease of Learners #224464

Such is the expedition of this enticing mode of commu nicating knowledge, that the Elements of Euclid can be acquired in lefs than one third the time ufually employed, and the retention by the memory is much more permanent; thefe facts have been afcertained by numerous experiments made by the inventor, and feveral others who have adopted his plans. The particulars of which are few and Obvious; the letters annexed to points, lines, or other parts of a dia gram are in faét but arbitrary names, and reprefent them in the demonfiration; infiead of thefe, the parts being differ ently coloured, are made B to name themfelves, for their forms in correfpond ing colours represent them in the demonf'tration.