78 



AN INNUMERABLE FLOCK. 



PASSENGER PIGEONS. 



plisli their flight, — as their rate of speed was equal to live 

 hundred yards a minute, its length would be two hundred 

 thousand yards ! Supposing, now, that each square yard 

 was occupied by ten pigeons, we may conclude that their 

 total number amounted to one billion, one hundred and 

 twenty million, and one hundred and forty thousand : and 



