206 HELEN L. M. PIXBLL-GOODRIOH. 



and fi-eedom from highly chromatic substance in the cytoplasm. Iron- 

 hajmatoxylin and picro-nigrosin. 



Pig. 6. — A similar cell from the suboesophageal ganglion of a bee 

 seven days after hatching showing the periphery of the cytoplasm 

 already becoming slightly vacuolated. Ehrlich's hsematoxylin and 

 orange G. 



Pig. 7. — A corresponding cell from a foraging bee on returning to the 

 hive laden with pollen. The cytoplasm is decidedly vacuolated at the 

 periphery. Ehrlich's hsematoxylin and eosin. 



Pig. 8. — A corresponding cell from a bee unable to fly, apparently 

 senescent. Ehrlich's hsematoxylin and orange Gr. 



Pig 9. — A corresponding cell from a bee dying in March after hiber- 

 nation. Iron-hsematoxylin and orange Gr. 



