30 



PHYSIOLOGY OF THE HONKY-HEfc:. 



ill 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. Tlie bh)od. "soaking through 



Fig. 16. 



XFHVOfS SYSTEM OF THE HONEY BEE. 



(Magnified. After Br.rb6.) 



tlie 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. 



