This is a self-teaching course. The prerequisite for this course is Plane Geometry: Course One by John R. Clark and Roland R. Smith.

Course Two covers Constructions, Locus, Ratio and Proportion, Polygons, and Geometry in Aeronautics.

Space is provided in the back of the book for writing and drawing. Both blank paper and grid paper can be found there.

The authors suggest that proving a geometrical proposition is comparable to climbing a tower. The steps leading to the first platform are labeled "undefined terms." From there the steps to the top of the tower are "postulates," "axioms," "defined terms," and "theorems."

In my opinion, this self-teaching 1941 text for teaching plane geometry is a good as, perhaps even superior to, the programmed learning texts that followed the behavioral model of "frames" proposed by B. F. Skinner in the 1950s and '60s. ( )