728 
In three cases both posterior longitudinal fascicles were cut. With- 
out exception the posterior longitudinal bundles were found degene- 
rated, as well above as below the lesion, but not always equally 
heavily. Especially to the oral side the number of strongly stained 
fibres rapidly diminishes, reminding of Grex and Toorn’s observation °), 
which particularly strikes one in 114, where within the domain of 
the oculomotor nuclei the lesion was performed. As well the ascend- 
ing as the descending degeneration involves in these cases the whole 
area of the longitudinal bundle. 
The physiological result is naturally different, according to the 
additional lesion of the cerebral stem. The spontaneous locomotion is 
always seriously interfered with. Forced movement, in the form of 
manege-movement, is as a rule absent and the stature of these animals 
answers to the description of the attitude after exstirpation of both 
labyrinths. Only in case 90 as an exception manege-movement to the 
right was observed, which in this case should be attributed to the 
fact, that a bloodextravasation had happened at the cross-section of 
the left longitudinal bundle, which had caused during some days 
an asymmetrical irritation. This is inferred from the results after 
unilateral section of the longitudinal bundles. 
In a second series of experiments a unilateral lesion of the 
longitudinal bundle was applied, with little or no lesion of the DrrrErs 
Complex. In these three cases regularly an ascendent degeneration 
of the lateral part, especially of the severed longitudinal bundle was 
observed. Downward equally degeneration in the middle part of 
the cross section of the bundle was found, whereas also on the other 
side in the same field some degeneration was noted. Equally regu- 
larly in these cases manege-movement to the side of the non-sectioned 
longitudinal posterior bundle was observed during life; solely on 114 
also the allied symptom of conjugated deviation of peal and eyes 
was noted. 
In a third group a unilateral lesion of the Drrrers Complex was 
caused. In this series of animals the results were neither anatomic- 
ally, nor physiologically so easy to understand as in the two first 
groups. Regarding the degenerated fibres in the posterior bundle, 
they are in all cases far less numerous, compared with direct lesion 
of the bundle; also here it holds good more than for group 2, that 
degeneration, limited on one side only, is a rare occurrence; but in 
all cases very decided predominance of the degeneration on one side 
was found. Of these (7) animals in one (158) a total longitudinal 
lesion was performed at the left side of the left longitudinal fascicle, 
1) Brain 1898. 
