GENERAL STRUCTURE. 



43 



How full of wonder and beauty is all this. A bee 

 runs into the hive, but it can only do so because 

 nerves stimulate, and a large number of muscles, each 

 containing many fibres, respond in accurate order, for 

 no joint of a single limb but moves as it ought in 

 obedience to the directing nerve-centres within the 



Fig. 10.— Jaw of Queen, with Muscles (Magnified). 



Ifm Lesser Flexor Muscle ; gfm, Greater Flexor Muscle ; lem, Lesser Extensor 

 'Muscle ; em, Extensor Muscle ; m, Mandible ; n, Notch ; og, Gland 

 System (the Olfactory Gland of Wolff). 



insect. How quickly movement follows upon move- 

 ment, every step involving a complete circle of 

 changes. How tiny the muscles, how impalpable the 

 nerves, and yet large are they in comparison with 

 some others to be found in the same family of 



