Class of the Honey Bee. 

 Fig. 1. 



21 



A Trachea, magnified. 



peculiar in their structure. They are formed of a spiral thread, 

 and thus resemble a hollow cylinder formed by closely winding 

 a fine wire spirally about a rod, so as to cover it, and then 



Fig. 2. 



Respiratory Apparatus of Bee, magnified. — After Duncan. ^ 



