74 Bulletin of Laboratoiies of Dcjiison University [Voi. xiii 



The position of this area of the carp is indicated in Fig. 

 22. It is reached, as shown in the figure, by a slender branched 

 process of one of the chief tertiary neurones, which may be a 

 dendrite, but more probably is a collateral neurite, though it 

 does not spring from the main neurite {n), which enters the ter- 

 tiary tract separately. The neurone marked a lies in the adja- 

 cent section and is drawn enlarged in Fig. 25. From the base 



Fig. 22. Section taken through the superior secondary gustatory nucleus 

 of the carp. Golgi method. X40. 



The section is approximately transverse, but strongly inclined so that the 

 dorsal and right sides are father caudad. A single chief tertiary gustatory neu- 

 rone is shown, whose neurite {n) enters the tertiary gustatory tract. Its main den- 

 drite passes out of the plane of the section (cf. Fig. 25). A much more slender 

 process is completely impregnated, running dorsad and caudad to reach the sub- 

 stantia reticularis grisea trigemini [s.r.g.). At a is shown the position of the neu- 

 rone drawn in Fig. 25, which lies in the section adjacent to the one here drawn. 

 The secondary gustatory nucleus is bordered on the dorsal and mesial sides by 

 the fibers of the tertiary tract. 



of its neurite is given off a collateral, only a part of which is 

 shown, which is probably of the same type as the one here fig- 

 ured. Contiguous sections of the same series show fibers pass- 

 ing from this area of substantia reticularis directly into the axis 

 of the secondary gustatory nucleus and there arborizing, which 

 probably represent dendrites of the cells of the substantia retic- 

 ularis which are not impregnated. 



