Ken YON, The Brain of the Bee. 177 



it decreases in size and joins several other fibers, the whole of 

 which were not impregnated, and forms with them a band of 

 fibers traceable down behind the lobe until hidden by the inter- 

 vening strongly impregnated glomerulae. As this band occu- 

 pies the same position as the antenno-motor root seen in ordi- 

 nary preparations I take it for granted that the fiber is motor 

 and belongs to this nerve. The large part of the fiber inclines 

 posteriorly in passing upward, terminating, so far as traceable, 

 very close to the inner root of the mushroom body at some little 

 distance from the median line. Three of its branches are im- 

 pregnated. The lower one passes forwards towards the inner 

 side of the antennal lobe and does not subdivide. From this 

 fact and its apparent destination I have supposed that its cell of 

 origin is situated among the cells filling this space between the 

 lobe and the commissure. Higher up two branches are given 

 off nearly together, one passing internally towards the median 

 line, and the other, which is much longer, passing outward and 

 downward in the trito-cerebral region and branching. But here 

 it is obscured by other details. A short distance above this an- 

 other long branch is given off This goes diagonally backwards to 

 the posterior-lateral angle of the proto-cerebron ending in several 

 small branches. 



In other sections made in the horizontal plane fibers of a 

 similar appearance were found taking a horizontal course and 

 passing apparently beneath the antennal morula (PI. XIX). 

 These branch, as shown in the diagram, much more profusely 

 than the other one just described, a fact that is doubtless due to 

 their better impregnation. One sends a long slender process, 

 or rather continues as such, backwards to the layer of cells 

 clothing this part of the brain. But whether it actually arises 

 from any of them I am unable to say. It is not impossible, and, 

 if one considers the fiber shown on the opposite side of the 

 plate, which after branching profusely and irregularly sends off 

 a slender process in the direction of the antenno-motor nerve, 

 it may not seem improbable. The details are not sufficient to 

 settle the matter, however, and until they are shown to exist, I 

 shall be inclined to believe that probably all the cells giving rise 



