Cicero, on the how-to of public speaking.........

"A leading speaker will vary and modulate his voice, raising and lowering it and deploying the full scale of tones.  He will avoid extravagant gestures and stand impressively erect.  He will not pace about and when he does so not for any distance.  He should not dart forward except in moderation with strict control.  There should be no effeminate bending of the neck or twiddling of his fingers or beating out the rhythm of his cadences on his knuckles.  He should extend his arm at moments of high dispute and lower it during calmer passages....Once he has made sure he does not have a stupid expression on his face and or a grimace, he should control his eyes with great care, for as the face is the image of the soul the eyes are its translators.  Depending on the subject at hand they can express grief of hilarity."