Kenyon, TJie Brain of the Bee. 173 



The Deuto-cerebron. 



THE ANTENNAL LOBE. 



The antennal lobes comprise by far the larger portion of 

 this division of the insect brain, especially so in the honey bee, 

 and the rest of the Hymenoptera for that matter, where the 

 remaining small portion is so fused with the proto- and the 

 trito-cerebron as to leave little or no trace of separating 

 boundaries. 



Considering first the antennal lobes, one may say that sec- 

 tions cut in various planes show that each lobe is composed 

 internally of a nearly spherical mass of fibrillar substance con- 

 nected with the rest of the brain by a small neck of the same 

 substance and surrounded on all sides by a large number of cells, 

 some of which belong to it and some to the proto- and the 

 trito-cerebron, and fill in the deep spaces between it and these 

 two parts. Inside of this sphere and near or composing its 

 periphery one finds small globular masses that by any of the 

 ordinary methods of staining take a much greater depth of 

 color than the more internal part, and in them one recognizes 

 the great non-nucleated cells of Leydig ( 64) and Rabl-Ruck- 

 hard ( 75), which were first more correctly described by Dietl 

 ( 76) as olfactory bodies. Flogel ( 78) claims the honor of point- 

 ing out their true significance, for, he says, he called attention 

 in an unpublished communication to the Kieler Physiologische 

 Vereins, July 30, 1874, to the fact that they are not cells. 

 Fig. I shows the bodies or glomerulae very plainly. 



Between them even in ordinary preparations processes from 

 the bordering cells may be traced to the inner fibrillar sub- 

 stance, but it is doubtful whether branches entering them may 

 be seen in such preparations. Cuccati ( ss) regarded them 

 along with the rest of the mass as made up for the most part 

 of branches of these processes that by subdividing formed with 

 whatever other fibers that might be there a sort of net work. 

 The only difference that he supposed to exist between them and 

 the central portion of the mass was in the greater fineness of 

 the meshes of the net. But while his supposition with respect 



