1 88 Journal of Comparative Neurology. 



the inner tract to be describe'd a little farther on, and which is 

 also the main tract discovered by Bellonci. Viallanes (§7) 

 found the tract in the wasp and for the first time described it 

 correctly. 



In certain of my preparations of the brain of the bee by 

 the copper-haematoxylin method these antenno-cerebral tracts 

 are very distinct and very easily followed. This is the case in 

 sections cut in any of the three planes. 



The Innc7' Antcnno-ccrcbral Tract. 



The one first to be described is the largest and also the one 

 first discovered. It arises in the neck of fibrillar substance con- 

 necting the antennal morula with the rest of the brain and as- 

 cending upwards, inwards and backwards (fig. 2) it passes be- 

 tween the two ventral commissures of the dorso cerebron (fig. 

 10). Thence curving backwards somewhat it passes behind the 

 root of the mushroom bodies and the outer hinder margin of 

 the central body and in front of the fibrillar arch (figs. 8 and 9) 

 to the level of the superior commissure, behind which it may 

 be seen in section in fig. 7. From here it bends forward and 

 passing around in front of the inner stalk of the mushroom 

 body enters the inner cal}'x at its junction with the stalk and on 

 the antero-lateral side of the latter. 



In bichromate of silver preparations I have several times 

 found the fibers of the tract impregnated for nearly their entire 

 length. And in many cases different portions of the tract in 

 successive sections were so well impregnated that their superim- 

 position was a very easy matter. Fig. 24 represents the super- 

 imposition of three sucli sections and shows the tract from 

 the calyx above to the inside of the antennal morula below. In 

 no case have I found fibers from a glomerula passing into the 

 tract, but the arrangement of the many fiber-fragments that 

 have been seen almost conclusively demonstrated that they enter 

 it (fig. 24). The fiber from the glomerula shown in the figure 

 offers a very good example. 



Nor have I found the fibers in cennection with cells, but, 

 considering their connection with the glomerular as practically 



