30- 



PHYSIOLOGT OP THE HONEY-BEE. 



in the thorax, and in the head, by the aorta, which is not eon- 

 tractible. Each room of the heart presents, on either side, an 

 opening for the returning blood. The blood, "soakmg through 



Fig. 16. 



NERVOUS SYSTEM OF THE HONEY BEE. 



(Magnified. After BarbS.) 



the body" (Cheshire), comes in contact with the air contained 

 in the tracheal ramifications, where it is arterialized, or in 

 plainer words, renovated, before coming back to the heart. 



