144 TH E SPEECH OF MONKEYS. 



oral sounds. Sounds which only express emotion 

 are not speech, as emotion is not thought, although 

 it is frequently attended by thought, and is a cause 

 of which thought is the effect. Music expresses 

 emotion by means of sounds, but they are not 

 speech, and even though the sounds which ex- 

 press them may impart a like emotion to the 

 hearer, they are not speech. The sounds which 

 express crying, sighing, or laughter may indeed 

 be a faint suggestion of speech, since we infer 

 from them the state of the mind attending the 

 emotions which produce them ; yet they are not 

 truly speech. To be regarded as speech the ex- 

 pression must be preceded by consciousness and 

 the desire to make known to another the sensa- 

 tion by which the expression is actuated. As 

 the impulse can only come from within, it ap- 

 pears that emotion is one source from which 

 thought is evolved, and speech is the natural 

 issue of thought. Desire gives rise to a class 

 of thoughts having reference to the sensations 

 which produce them, and such thoughts find ex- 

 pression in such sounds as may suggest supplying 

 the want. As the wants of man have increased 

 with his changing modes of life and thought, 

 his speech has drawn upon the resources of 



