An educator, or person with a message to give is referred to as : lecturer, speaker, orator, preacher, narrator, reciter, etc. These words generally imply the conveyance of a message through the ear without reference to the eye. Until the cinema was equipped with sound there was a move to use the word "optience" instead of "audience." Although the moving picture now combines perception through both the eye and the ear, the messages generally conveyed today by the motion picture are descriptive rather than quantitative. The moving picture projector has not thus far been a great influence for introducing the type of graphic presentation indicated in this book. Lantern slides, and more recently, slide films, have been important factors.

There are interesting possibilities if educational institutions would seriously study the methods for presenting ideas and facts, and then, as their instructors qualified in the new technique, designate each by the term "Presentor." In a similar way, a student might be called a "Perceivor." Each of these terms implies re-

•iiSf'45

H. Gray Punkhouser. "A Note on a Tenth Century Graph." OSIRIS. Vol. I. 1936.

A Tenth Century Graph That Forms a Part of a Manuscript Discovered by Sigmund Sunther in 1877

According to the article by Dr. Funkhouscr, from which this illustration was taken, the graph was meant to represent a plot of the inclinations of the planetary orbits as a function of the time.

INTRODUCTION

sponsibility for results. These terms are not limited in their scope to the field of education. Anyone planning a conference, convention, committee, discussion, assembly, council, etc., might do well to consider the method for presenting the subject matter. How many of these meetings today are just talk? If each participant would consider himself as a Presentor of data or ideas that he is especially qualified to contribute to the group, there would be less misunderstanding and more conclusive action.