30 



PHYSIOLOGY OF THE HONEY-BEE. 



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

 tractible. Eaeh looai of the heart presents, on either side, an 

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



Fig. IG. 



XEKVOUS .SYSTEM OF THE HONEY BEE. 



{IJagnifled. After Barbo.) 



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

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

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



