Kenyon, TJie Brain of the Bee. 195 



of the cells about a ganglion so as to render it possible to rup- 

 ture individual cells and not fibrillar connections, and sufficient 

 time is allowed to elapse for the degeneration of the dendrites 

 and neurite of the ruptured cell, it will doubtless be found that 

 ventral and lateral portions of the ganglion are motor. 



Such careful experiments are needed and, performed upon 

 the ventro-cerebron, they may, by the aid of either the methy- 

 lin blue intra-vitam or the bichromate of silver method, be able 

 to demonstrate which of the large number of cells located there 

 perform the function of co-ordinating the movements of the 

 body. 



The association fibers of this ventral region of the brain 

 are numerous, and of the many fragments of them seen one of 

 the best is shown in fig. 24. This, as is evident from the fig- 

 ure, occupies the upper portion of the commissural region and 

 sends the greater part of its branches and branchlets dorsally 

 into the lateral region of the proto-cerebron in the dorso-ventral 

 plane of the anterior root of the mushroom bodies. One branch 

 passes forward inside the inner antenno-cerebral tract. 



Numerous fibers may be found connecting the antennal 

 morula through its neck of fibrillar substance with the com- 

 missure. A single fragment shown in plate XX (fiber 37) sends 

 a process upward in the posterior region that branches below 

 the level of the ocellar glomerulae, while another is sent forward 

 apparently to the antennal lobe. Just before reaching this it 

 sends a secondary branch downward into the ventro-cerebron. 

 The fibers seen entering the ventro-cerebron from the ventral 

 cord are in some cases remarkable for their size. These large 

 fibers occupy the dorsal region and have already been spoken 

 of in connection with the nerves of the ocelli. Fragments of 

 them have been seen as far back as the first thoracic ganglion, 

 and anteriorly, as before noted, they have been traced in bichro- 

 mate of silver preparations into the proto-cerebron behind the 

 ocellar glomerulae. Branches are given off in this region that 

 pass among the glomerulae to the commissural region as shown 

 in the plate. Much shorter ones are given off in the ventro- 

 cerebron. Another large fiber (fiber 38) apparently ends in the 



