"Approved May 14, '15, J.L. Meriam."Includes a letter of approval from W.L. Curtis.Typescript.This thesis is an attempt at the solution of a problem which has grown out of some discouragements and difficulties experienced in connection with three years of teaching biological sciences to first year high school students in the public schools of this state. The problem is the outcome of two convictions. The first of these is that the discouragements and difficulties mentioned were the natural consequences of an attempt to teach, in the most direct way possible, the fundamental facts and principles of the science. The second of these is, that to accomplish the best results in such a course, the fundamental aim should be to teach those things of...