PHYSIOLOGY OF THE BEE. 



81 



in their bodies the head, the thorax, and the abdo- 

 men. As the nature and arrangement of the nervous 

 system forms one of the soundest bases of classifica- 

 tion in the highest of the three kingdoms in nature, 



FIG. 22. NERVOUS SYSTEM OF PRIVET HAWK-MOTH. 



we shall first direct attention, in each case, to this all- 

 important matter of detail. The general arrange- 

 ment of the nerve-matter in the sub-kingdom 



G 



