917 
Examination of the labyrinthine “Stellreflexe” of rabbits after 
uni-lateral labyrinth extirpation has shown that the ‘“Labyrinth- 
Stellreflexe” are superimposed upon the turning of the neck above- 
described and looked upon as utriculus-reaction, in such a way that 
they try to bring the head into such a lateral position that the 
intact labyrinth is uppermost. In this position the ‘‘Stellreflex’’ 
proceeding from the intact labyrinth has its minimum. 
Whenever, on the contrary, the intact labyrinth is found under- 
neath, the ‘“‘Stellreflex’’ has its maximum. 
If the head be placed in any chosen position, the animal will 
not rest until it has got its head back as far as possible into such 
a position that the ‘Stellreflex’” proceeding from the intact labyrinth 
is as small as possible. There is only perfect rest when, as has been 
said above, the intact labyrinth is uppermost. If the model be 
examined to see in what position the otolithes now are, it will be 
seen that the sacculus otolith stands horizontally and presses upon 
the sensory epithelium. 
On the other hand, the greatest unrest is observed when the head 
is placed into such a position that the intact sacculus otolith hangs 
from the sensory epithelium. 
Thus, in the case of the “Labyrinthstellreflexe”’ after uni-lateral 
labyrinth extirpation, it can be proved with certainty that the 
maximum stimulation proceeds from the otolith when it hangs, and 
the minimum when it presses. 
The ‘“Labyrinth-Stellreflexe’” on the head, by means of which, 
when both labyrinths are intact, the head is invariably brought back 
from an asymmetrical to a symmetrical position, are explained by 
the coöperation of the stimuli from both labyrinths. The head comes 
to rest in such a position that the stimuli arising from the two 
sacculi are equally strong. 
From the above it is clear that the maximum positions of the 
right and left labyrinths differ for the above-described ‘‘Stellreflexe” 
approximately 180°, from which it follows that they must be sacculus 
reflexes and not utriculus reflexes, since the utriculus otolithes lie 
almost in one horizontal plane, while the sacculus otolithes form an 
angle of 120°—140°—150° with each other. 
Besides the ‘Sacculusstellreflexe” just described, by which the 
head is brought back from asymmetrical to symmetrical position, 
we must assume that there are other labyrinthic ‘“Stellreflexe’, as 
the head is not merely brought into an undetermined symmetric 
posture, but always into such a position, that the vertex is above, 
the lower jaw below, and the mouth rather under the horizontal 
