1895 THE MICROSCOPE. 167 



leaves the hive oaly once or twice during a lifetime, has 

 no air sacs^ the only air vessels being the large and small 

 trachae. 



The Nervous Spste?n. — This consists of a pair of straight 

 parallel chords of nerve substance that lie side by side 

 and run along the whole ventral side of the body. Upon 

 these chords are distributed several ganglia, resembling 

 beads strung upon two strings (fig. 18). First there is 

 the brain ganglion which is two fused into one and situ- 

 ated in the head above the throat. It sends out nerves 

 to the compound eyes, the simple eyes and the feelers. 

 The next centre sends nerves to the mouth and the first 

 pair of legs. The central thoracic ganglion is the largest 

 and supplies the nerves to the other four legs and to the 

 wings. Behind this and in the abdomen are four of 

 small proportions which give nerves to the different seg- 

 ments, whilst the last supplies the reproductive organs. 



It has been stated that the air sacs are wanting in the 

 queen bee, in their place two objects much resembling 

 two bunches of grapes will be found. These are the 

 ovaries and are composed of an assemblage of tubes 

 collected in a bundle, closed at one end, the ether end 

 opening into a common trunk called the " proper 

 oviduct." These two ducts unite and form the "common 

 oviduct " through which the eggs pass into the cells 

 prepared for them by the worker bees. There are three 

 kinds of these cells and the queen knows which eggs to 

 deposit in the different cells. The queen cells are much 

 larger than the others and are circular in form (fig. 23). 

 The queen larvae (fig. 22) are fed on different food from 

 the others, but in case all the queen larv« are des- 

 troyed a worker egg or a young larvae may be transferred 

 to a queen cell, fed on royal food and produce a queen 

 bee. 



