50 



Bulletin of Laboratones of Denison University. [Voi. xiii 



nated. The layer of root fibers is not impregnated in this prep- 

 aration, but its relations are suggested in Fig. 8 and more clearly 

 in Fig. 6. In Fig. 8 root fibers are stained in the ventral part 



al lobe 



■Tf~ '- sec. 1/1/ 

 -' ^ 1 motor /auer 



I^ig 7. Section through the vagal lobe of a young carp, 5 cm. long. GOLGI 

 method. X 40. 



The section is approximately sagittal, but strongly inclined so that, while 

 the caudal end (at the left of the figure) is near the median line, forward it 

 passes toward the right. It includes, therefore, the motor nucleus of the right 

 vagal lobe and the right side of the facial lobe, only the extreme caudo-ventral 

 border of which is indicated. The preparation gives a typical view of the chief 

 secondary gustatory neurones of the vagal lobe. One of the smaller secondary 

 neurones («) is shown at the extreme ventral (lower) side of the vagal lobe (cf. 

 Fig. II). A few scattered neurones of the deeper portions of the layer of sec- 

 ondary neurones are imperfectly impregnated. A few thick fibers are seen to 

 pass from the layer of secondary neurones into the motor layer to arborize widely 

 among its cells. Their origin could not be determined, but is probably trom 

 some of the deeper cells of the layer of secondary neurones. Asc.scc. X., ascend- 

 ing secondary gustatory tract ; moi. X r., motor root of the vagus. 



of the vagal lobe, but only secondary neurones in its dorsal 

 part. In preparations where both are impregnated together 

 the peripheral layer of secondary neurones presents an inde- 

 scribably intricate complex of interlacing fibers. Fig. 9 shows 

 a single one of the chief secondary neurones of Fig. 8 drawn 

 separately on a larger scale. 



