INVENTIONAL GEOMETRY. 



359 



wHch began the study in September of the past school year and 

 continued it till February, afford some suggestion of the scope of 



inventional geometry. Each 

 pupil is equipped with a ruler, 

 which he uses merely as a 

 straight-edge, a pair of draw- 

 ing-compasses, and a right- 

 line pen. For a short period 

 I drawings are made with lead- 

 j pencil, till the pupil has ac- 

 quired a little manual skill ; 

 then the change is made to 

 pen, and all problems must be 

 drawn in ink. Neatness and 

 accuracy are insisted upon, 

 and secured. 



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The class, having worked at their desks the problems assigned 

 for a lesson, come up for recitation, and are directed to put their 



