314 EVOLUTION, OLD AND NEW. 



inflexions of the voice — therefore by a succession of 

 efforts this race arrived at the utterance of articulate 

 sounds. A few only would be at first made use of, and 

 these would be supplemented by inflexions of the voice : 

 presently they would increase in number, variety, and 

 appropriateness, with the Increase of needs and of 

 the efforts made to speak. Habitual exercise would 

 increase the power of the lips and tongue to articulate 

 distinctly. 



" The diversity of language is due to geographical 

 distribution, with consequent greater or less isolation 

 of certain races, and corruption of the signs originally 

 agreed upon for each idea. Man's own wants, therefore, 

 will have achieved the whole result. They wHl have 

 given rise to endeavour, and habitual use will have 

 developed the organs of articulation." * 



How, let me ask again, is " the case of neuter insects " 

 " demonstrative " against the " well-known " theory put 

 forward in the foregoing chapter ? 



• ' Phil. Zool.,' torn. i. p. 347. 



