Kingsbury, Brain of Nechinis. 173 



spoken of as the "so-called sensory " nidus (Strong '93). In 

 Nectiiriis the three contingents, to the seventh, ninth and tenth 

 nerves, which leave this fasciculus are formed of fine fibers with 

 delicate myelinic sheaths. These pass to their exit, dorsad of 

 the ascending V, as is also the case in Amblystonia, differing in 

 this respect from the condition in the tadpole (Strong '95) where 

 they pass ventrad of it. 



The homology of the fasciculus solitarius of man, lifted 

 from the root bundle of X"^, has been placed by Strong upon this 

 tract. This had been contemplated in this investigation before 

 the appearance of Strong's work, and rejected as not capable of 

 establishment from the facts. Although this homology is set 

 forth by him in a most forcible and enticing manner, a hesita- 

 tion is yet felt in accepting it for the following reasons : the 

 fasciculus solitarius of mammals and the ascending V are re- 

 garded as entirely comparable tracts ; both become meduUated 

 early ; both may be traced caudad into the myel, and are accom- 

 panied throughout their course by gelatinous substance, chiefly on 

 their mesal side, containing cells which constitute the end nidi 

 of the tracts. (See Turner '94 and KoUiker '93). The fasciculus 

 conwiunis and ascending V in Amphibia appear to be quite differ- 

 ent tracts. Further, by considering \he fasciculus communis as 

 representing t\\Q fasciculus solitaiius alone, we leave unacounted 

 for the larger end nidus of vagal sensory fibers. Strong appar- 

 ently confounds this with the end nidus of the fasciculus soli- 

 tarius. The strongest evidence in favor of the homology would 

 be the exit of fasciculus solitaritis fibers as the pars intermedia 

 Wrisbergii now considered as a sensory root of the seventh, 

 with the geniculate ganglion as its nidus of origin, which is af- 

 firmed by Kolliker ('93) ; by others, however, the end nidus of 

 the glosso-pharyngeus has been stated to be the end nidus of 

 this nerve, Brandis ('93) in speaking of ^o. fasciculus solitarius 

 in the brain of birds, stated that a portion of the fibers turned 

 laterad to the eighth nerve and the remainder entered the trigem- 

 inal nerve, ^ 



^ A similar relation of the bundle to the fifth is also given for man by 

 Boettiger ('90). 



