30 



PHYSIOLOGY OF THE HONEY-BEE. 



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

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

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



Fig. 16. 



NERVOUS SYSTEM OF THE HONEY BEE. 



(Magnified. AJ'ter Barbo. ) 



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. 



