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lively humming ; then, placing her in this condition near a cobweb, 

 but in such a situation that hidden a spider is unable to see her, 

 the humming sounds of the fly will soon call the spider's atten- 

 tion, which will quickly appear at the entrance of the cobweb in 

 order to capture the prey. Now, repeating to remove and replace 

 the fly will always effect the same results. 



The doubtful presumption of man concerning the hearing 

 faculties of insects, is generally dictated by his empirical opinion, 

 considering his hearing faculties, the normal measurement by 

 which he forms a comparison between himself and the animal at 

 general. There is, however, an extreme distinction of the hearing 

 faculties between the class of insects and the vertebrate kingdom, 

 especially man. The power to analyze the sounds and tones is in 

 close relation with the powers of intelligence. The ear of man, 

 in coincidence with his intelligence, is adapted to reflect at the 

 same time on a number of different sounds ; and a well adapted 

 musical ear is capable to analyze and detail these various sounds 

 into their very components, in a very limited time. 



But, as generally the human mind is too deeply absorbed in 

 the vortex of speculations and mental activity, the power of 

 reflection and analyzation will thereby remain naturally more 

 indifferent to these prevailing sounds ; except a born musician is 

 subjectively more able to reflect upon the effects of sounds and 

 tones. 



Now, on the other hand, far different to this are the hearing 

 manifestations of the animal. Although the hearing faculties of 

 the criminal are also, to that extent, capable to perceive the con- 

 verging sounds and able to analyze and detail them to a certain 

 extent, according to its own personal interest it remains generally 

 indifferent to all those sounds, which imply no indication of 

 effects which would be beneficial to its individual welfare. 



An animal will naturally adapt its hearing faculties to noth- 

 ing else but to the use of ideal obejcts, or matter concerning its 

 existence that is, food, generation and comfort. Therefore, 

 an animal concentrates its power of analyzation to sounds, which 

 are in direct connection with ideal objects. 



Hence the hearing sense of the animal is more expediently 

 susceptible to all those various sounds and tones coming from 

 related sources, that is, from male to female, and conversely. 



