1874.] accompanying the Articulation of the Human Voice. 279 



eating with it, I read from a book until the balloon was filled, taking care 

 to close the elastic tube when it was necessary to take breath. 

 The results were as follows : 



Time required. No. of syllables. Cubic inches. 

 84 seconds 353 523 



84 353 523 



From another part of the book 90 364 523 



95 364 523 



Mean 86 359 523 



Showing an average of about 1| cubic inch of air for each syllable, and 

 rather more than four syllables per second, including stops. 



Without stops, from five to six syllables can be pronounced in a second. 



The lungs appear to be capable of exerting considerable pressure in 

 the expulsion of air ; but distinct articulation becomes difficult against a 

 pressure of 2 inches of water, and I could not pronounce any words 

 against a pressure of 4 inches, without considerable exertion. 



The following diagrams made by the instrument show the degree of ac- 

 cordance obtained when the same words are repeated by the same speaker : 



Experimental Tests. 



One of the first features manifested in using the instrument is the 

 action produced by the silent discharge of air from the mouth, after a 

 syllable or word or a sentence is pronounced. This silent discharge 



z2 



