16 



PHYSIOLOGY OF THE HONEY-BEE. 



resembles a string of onions, is absent in the drones and 

 queens. According to Girard, these upper glands were dis- 

 covered by Meckel in 1846. They are very large and dilated 

 in the young worker bees, while they act as nurses, but are 

 slim in the bees of a broodless colony. In the old bees, that 



Fig. 6. 



SALIVARY GLANDS OF THE WOEKER-BEB. 



(Magnified. After Barba. ) a, a, glands of the head; h, glands ol 

 the thorax. The two upper pairs are glands of the head,, the lower 

 are glands of the thorax. 



