53 



sexual mates, as they did when they were still in the midst of 

 their golden liberty, sitting on the nest, singing and warbling 

 solely to beguile the incubation of their females. 



The impulse of the joyous singing, to put forth such sweet 

 melodies in order to charm their sexual mates, is a too strongly 

 habitual, pathetical manifestation that it could be extinguished by 

 the means of isolation or any form of confinement. Its impulse 

 is naturally analogous to the genius of a born musician, where 

 the power to produce melodies is so determining and its tendency 

 too impulsive to exert itself and tending to exaggerate the sub- 

 Hmest effects. 



Expressions of Monkeys. The best adapted forms of ges- 

 tures and vocal sounds in the vertebrate kingdom will be observed 

 among the monkeys. According to their refined anatomical and 

 psychological constitution, which resembles mostly mankind, they 

 are impelled to associate and form extensive colonies in order to 

 maintain better their social and mutual welfare. 



Moreover, in compliance with their delicate constitution, 

 which logically requires also an equally refined condition of exis- 

 tence, the predominating idea of individualization, to maintain 

 an ideal existence, is becoming equally more intensive and of a 

 more rational determination ; that is, the feelings representing the 

 idea of individuality and which also constitutes emotion, are be- 

 coming more sensitive and susceptible. Their tendencies for 

 refinement and exaltation, viz., pleasant feeling, are growing more 

 impulsive and determined to shape an ideal existence. Subse- 

 quently, it follows the development of higher sentiment and the 

 aversion to brute and rough influences. 



These determining and intensive emotional feelings induce 

 the individual to intellectual exertion and rationality in order to 

 serve as means to obtain the desired ideal existence. According 

 to this, the emotional and intellectual faculties have become 

 most sensitive and reflexible influences of the monkey's psycho- 

 logical constitution. Naturally, they are the main factors induc- 

 ing the monkeys to associate and form colonies, and, through 

 mutual existence, they are capable to obtain the ideal existence 

 which corresponds with their intellectual and pathetical disposi- 

 tion. 



