Kenyon, TJie Brahi of the Bee. 203 



ing outward and becoming lost in the surrounding fibrillar sub- 

 stance. 



XXIX. A group outside of the last and behind the ori- 

 gin of the labial nerve sends a band of fibers nearly half way 

 through the mass behind the root of the nerve. 



XXX. Between the origins of the labial and the maxil- 

 lary nerves and outside of them on the lower lateral surface is 

 a large group whose fibers forming a well marked band pass 

 inward and then upward near the root of the maxillary nerve 

 and then upward and inward and apparently forward towards 

 the commissural region. 



XXXI. Considerably above the last, or on the upper lat- 

 eral surface and below the origin of the salivary nerve, is a group 

 whose fibers pass directly inwards and join those of the last 

 group near where these turn forwards. 



XXXII. Just above the one just described and in front of 

 the plane of the origin of the maxillary nerves is a group that 

 sends a band of fibers upwards into the commissural region. 



Conclusion. 



From the facts detailed in the preceeding pages it is evi- 

 dent that even though there are more difficulties in the way of 

 obtaining good results than with the vertebrates, a patient ap- 

 plication of the bichromate of silver method will throw as much 

 light upon the organization of the hexapod nervous system as 

 it has upon that of the higher animals. By its aid during the 

 past winter the minute structure of the so-called mushroom bod- 

 ies has been brought to light and several links added that almost 

 complete the chain of evidence demonstrating the function of 

 these peculiar bodies to be that of enabling the insect to intelli- 

 gently adapt itself to its surroundings. They are shown to be 

 connected at their calices with two pairs of sensory tracts of 

 fibers from the optic lobes, with three from the antennal lobes 

 and with one, that is probably also sensory, from the ventral 

 nervous system. Their roots are shown by fragmentary evi- 

 dence, sufficient to warrant the conclusion, to be very 

 probably connected with the inner terminals of motor, or possi- 



