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of sound-producing organs. Like all other life functions, de- 

 pendent upon and executed by these stabile spontaneous vital 

 energies, so are also the functions of demonstrative expressions 

 dependent and executed by these very same vital principles. 

 Their modes and forms become also stabile and prevailing 

 through all life-time of the organic being; latent or more or less 

 expressive during infanthood, they become gradually exerted 

 during the process of maturity. 



Now, though every specified class in the animal kingdom 

 descends in linear progression from one progenitor, the offsprings 

 have, during the course of evolution, immensely multiplied. 

 Furthermore, though all individuals of a certain order or species 

 are subject to the stabile vital tendencies, they have consequently 

 also maintained their inherited modus of demonstrative expres- 

 sion every particular point exhibited in the parent. 



Naturally, there prevails a remarkable uniformity of these 

 expressive functions between these related organic beings. The 

 progenies have reserved, owing to the stability of the vital forces, 

 all these particularities inherited from the far back progenitors; 

 except, some extraordinary circumstances may have compelled 

 them to alterate instinctively and rationally these inherited forms, 

 and adapt them to the present conditions of life. 



