Institutio Oratoria

The question of quantity is the simpler of the two, since as a rule it is either strong or weak, although there are certain kinds of voice which fall between these extremes, and there are a number of gradations from the highest notes to the lowest and from the lowest to the highest. Quality, on the other hand, presents more variations; for the voice may be clear or husky, full or thin, smooth or harsh, of wide or narrow compass, rigid or flexible, and sharp or flat, while lung-power may be great or small.

It is not necessary for my purpose to enquire into the causes which give rise to these peculiarities. I need not raise the question whether the difference lies in those organs by which the breath is produced, or in those which form the channels for the voice itself; whether the voice has a character of its own or depends on the motions which produce it; whether it be the strength of the lungs, chest or the vocal organs themselves that affords it most assistance, since the co-operation of all these organs is required. For example, it is not the mouth only that produces sweetness of tone; it requires the assistance of the nostrils as well, which carry off what I may describe as the overflow of the voice. The important fact is that the tone must be agreeable and not harsh.

The methods of using the