Kenyon, The Brain of the Bee. 187 



regions, which may be called deuto-cerebral, immediately be- 

 hind the antennal lobes. If it in any way connects the two 

 lobes or their glomerulae, it is only by means of intervening as- 

 sociation fibers. But such a connection is doubtful from phy- 

 siological reasons. It seems much more probable that the com- 

 missural fibers by the aid of association fibers of one side, 

 should connect the glomerulae of that side with motor fibers of 

 the other. Still the other supposition is not impossible, and 

 one should rather follow the maxim of Hunter, "do not think, 

 but go and see", and wait until facts, physiological or other- 

 wise, are obtained to decide the matter. 



The fibers of the posterior tract, which is separated from 

 the other by the ascending tracts from the antennal lobes to 

 the mushroom bodies, connect more posterior parts of the brain. 

 The fibers shown in fig. 38, apparently belong to this tract 

 since at the median line they occupy the same position. Here 

 they are obscured by a mass of precipitate filling the roof of 

 the foramen, but since there are no other fibers impregnated here, 

 there can be little doubt that the fibers of the opposite side are 

 a continuation of them. The branching and larger portion of 

 them is found in the posterior lateral lower angle of the brain, 

 and it is possible that they may originate from cells in this 

 neighborhood. One of them, it may be noted, sends a slender 

 branch forwards toward the antennal lobe. 



THE ANTENNO-CEREBRAL TRACTS. 



The existence of tracts of fibers passing upwards from the 

 antennal lobes into the proto-cerebron has been known ever 

 since Bellonci (82) published his account of them in GryUotalpa. 

 But of the three pairs of such tracts he seems to -have distin- 

 guished but two, and certainly misunderstood the relationships 

 of these. For he describes them as antenno-optic connections 

 passing from the antennal lobe upwards into the proto-cerebron 

 and to the optic lobes by way of the superior commissure, which 

 he recognized with Dietl and Berger as connecting the optic 

 lobes. The same error was committed by Cuccati (88) who 

 found in Souiomya what is unquestionably the homologue of 



