240 



ON INSECT SOUNDS. 



several separate sources. Dr. Landois, admitting it to be ditficult 

 to distinguish the insect note from the^wing-tone, says, that he 

 distinctly recognises with his ear the flight tone e', f or g' of the 

 fly, whilst its voice is capable of modulation between h', c", and b', 

 so that Marey's counted vibrations 330 agreed with the flight tone 

 e' heard by Dr. Landois. 



TABLE OF NUMBER OF VIBRATIONS CORRESPONDING TO 

 MUSICAL TONES. 



The letters C, D, E, F, G, H, in the column to the left are the several 

 notes of the octave. H in German notation stands for B of the English 

 scale. 



By reference to the accompanying table of musical notes and 

 their corresponding vibrations, it becomes easy to determine the 

 number of vibrations of the insect's wing, provided that the flight 

 tone be distinguished from the voice. — Besides the instance of the 

 fly. Dr. Landois states that the female of Bomlus museorum (moss 

 bee) hums in flight the note a, which is equivalent to 220 strokes 

 of the wing per second. The honey bee sounds with its wing 

 motion the note a', and therefore makes 440 per second, which is 

 just double the number of vibrations made by the moss bee. 



