GLAND STRUCTURE. 
125 
We may here remark that when the tongue is 
drawn back, the opening of Systems II. and III. is 
closed, and that of System I. open, and that this is 
just the right position for adding this secretion as the 
chyle is driven out. But only when the tongue is 
drawn out, as in sucking, is the outlet of Systems II. 
and III. opened, and it is then just in the right 
position to mix with the nectar as it is sucked into the 
honey stomach. 
Berlepsch (3), who describes these glands, and 
Holz {Bienenzeitimg)., also hold the view that secre- 
tion from System I. is added to the chyle food. 
