Art. ir.] Herrick, Gustatory PatJis in Fishes. 75 



These fragmentary data are sufficient to show that we have 

 in addition to direct connections of dendrites of the motor V 

 nucleus with secondary gustatory fibers, a similar but indirect 

 functional connection via the substantia reticularis grisea tri- 

 gemini. The numerous other connections of the latter area need 

 not now concern us. 



One of my Golgi preparations of the carp shows dendrites 

 of a very large neurone lying in the vicinity of the nucleus of 

 origin of the IV nerve sending dendritic branches ventrad into 

 the region caudad of the commissura ansulata and other large 

 branches farther caudad and laterad into the same portion of the 

 secondary gustatory nucleus which is reached by dendrites of 

 the motor V nucleus. The impregnation is so imperfect that 

 it is impossible to be sure whether this neurone belongs to the 

 motor nuclei of the eye muscle nerves or to the fasciculus lon- 

 gitudinalis medialis or to some other neighboring structure. 



?. Superior Secondary Nucleus audits Connections. 



The superior secondary gustatory nucleus presents, broad- 

 ly speaking, the same general arrangement as the primary end- 

 station in the vagal and facial lobes. That is, the secondary 

 neurones end in relation with two types of tertiary neurones 

 (i) intrinsic neurones, filling the interior of the nucleus ("Rin- 

 denknoten," Mayser) and (2) the chief tertiary neurones in a 

 dense layer around the periphery. The chief difTerence between 

 the arrangement of the primary and secondary end-stations 

 lies in the fact that the latter is connected with its fellow 

 of the opposite side by a broad commissure, the com- 

 missure of the secondary vagus nuclei of Johnston. As 

 was recognized by Mayser, this commissure contains 

 fibers of at least two sorts (i) neurites of the intrinsic 

 tertiary neurones, (2) terminals of a portion of the sec- 

 ondary gustatory tract. From (2) it follows that the secondary 

 tracts end partly on the same side and partly in the secondary 

 nucleus of the opposite side, the former portion being much the 

 larger. The uncrossed portion ends by free arborizations with- 

 in the secondary nucleus and also extensively in the cortical 



