" Lawyers, with their constant opportunity for practice , show a talent for public oratory that few doctors can equal. However, the physician, despite his more modest and hesitant delivery, has one great advantage over the most experienced lawyer . He is allowed to use slides, Slides of good quality conceal defects in oratory and they make for a confident speaker and a contented audience. By contrast, smudged, complicated or illprepared slides may draw attention to minor defects in delivery and make the audience inattentive." Zollinger and Hower and Howe