716 
On the right a cold-water flow: Reversion of the nystagmus. In 
ventral position right eye with quick component towards the nose. 
In other position same direction. Here, then, in caloric examination 
no influence on the direction of the nystagmus through change of 
the position of the head in space. This, no doubt, is anomalous. 
Compensatory eye-positions are no longer distinct. This again indi- 
cates the deficiency of the experiment. Repeated application of cold 
water in the right ear yields on the right a nystagmus with the 
quick component towards that ear. This nystagmus is not affected 
by the position of the head in space. 
The appearance of a nystagmus towards the douched ear on 
cold-water flow is the reverse of what is normally observed, 
and also the reverse of what was seen after the first washing. The 
imperfection of the experiment is also seen in the absence of any 
influence of the position of the head in space. 
In our first communication it has been shown that in cats the 
spontaneous nystagmus after unilateral extirpation of the labyrinth, 
with different positions of the head in space, varies in nature and 
frequency, but not in direction. In our investigation of the cold- 
water nystagmus in normal animals and in animals after unilateral 
extirpation of the labyrinth, on the contrary, a considerable differ- 
ence in the direction of the nystagmus with different positions of 
the head in space, has been demonstrated. It also appeared from 
subsequent experiments with rabbits that with them the case was 
fundamentally the same. Slight variations in the direction of the 
spontaneous nystagmus after unilateral extirpation of the labyrinth, 
however, do manifest themselves here, when the position of the 
head is varied, in consequence of the compensatory eye-positions, 
to be discussed later on, whereby the place of insertion of the 
eye-muscles in the orbita is altered. In the first communication evi- 
dence was also adduced to show that BArrrrs’s conception of the 
origin of the caloric nystagmus cannot be correct. 
In the present investigation we purpose to ascertain whether 
additional data can be collected to support the theory of BARANY, 
who ascribes the calorie nystagmus to endolymph-streams. 
There are plenty of indications in the literature; to our know- 
ledge an extensive experimental investigation has not been perfor- 
med as yet. 
Doubtless, the first question that arises is, whether douching of 
the meatus with cold-, resp. warm-water through the tympanum 
will engender such cooling down, resp. warming of the labyrinth- 
wall that endolymph streams are possible. 5 
