330 



THE VOICE 



additional muscles in gesticulation, etc. A speech of an hour*s 

 duration may tax his entire powers. To add to his troubles 

 he has to make himself heard in a large hall. Table LIV. gives 

 the relative values of the expenditure of energy in the utter- 

 ance of a single perceptible note in various sizes of halls. The 

 notes were produced by an artificial larynx (syren). 



TABLE LIV. 



These figures, multiplied by 2 x 10~ 5 , give, in kgms. per sec., the minimum 

 expenditure of energy necessary to make the sound perceptible in ten 

 different parts of the hall. 



In every case the possessor of a bass voice has to expend more 

 energy than the baritone or tenor. Generally speaking, the tenor 

 has least trouble in making himself audible, but instances may occur 

 where on account of its resonating qualities, a building may prove 

 more suitable for a baritone than for the former. 



