Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
There is another gesture not unlike
Again, there is the somewhat unusual gesture in which the hand is hollowed and raised well above the shoulder with a motion suggestive of exhortation. The tremulous motion now generally adopted by foreign schools is, however, fit only for the stage. I do not know why some persons disapprove of the movement of the fingers, with their tops converging, towards the mouth. For we do this when we are slightly surprised, and at times also employ it to express fear or entreaty when we are seized with sudden indignation.