949 
Also when the head is not in its normal position, the body lying 
on the ground in asymmetrical position can be restored by reflex- 
action to the normal position through asymmetrical stimulation of 
the ground. 
Optic “Stellreflexe” do not appear in rabbits after extirpation of 
the cerebrum. 
From the 2 communication ') it became evident that also the 
normal rabbit with cerebrum has only the above ‘“‘Stellreflexe’’ at 
its disposal. Optic “Stellreflexe”” could not be demonstrated in them 
either. 
The Std communication *) deals with observations made by Dr. 
Dosser DE BARENNE in experimenting on two cats and a dog after 
extirpation of the cerebrum. It could be proved that also with these 
animals only the four above-named “Stellreflexe” play a part; optic 
“Stellreflexe” could not be demonstrated in them either. 
Now, whereas with rabbits there is no difference between animals 
with and without cerebrum, this is altogether different with dogs 
and cats. 
From this paper it will be seen that normal dogs and cats, that 
is with a cerebrum, dispose of optic ““Stellrefleze”, and that with 
them the eyes may co-operate to enable the animals to retain their 
normal position. If one wishes to examine these optic reflexes, it 
is essential to hold the animals free in the air, for only then can 
the “Stellreflexe”, resulting from asymmetrical stimulation of the 
nerves of the trunk on body and head, be eliminated. 
Under these circumstances the animal depends for the time being 
only on its “Stellreflexe’, emerging from the labyrinth, and after 
bilateral extirpation of the labyrinth not any “Stellreflex” can appear 
in dogs or eats that have been deprived of the cerebrum, and in 
rabbits with or without cerebrum, if the animals are held up free 
in the air. It now appeared that dogs and cats with cerebrum, but 
without labyrinth, still dispose of “Stellreflexe”, which enable the 
animals to bring their head into the normal position. 
These “Stellreflexe’ are brought about by the eyes. 
In order to demonstrate this we communicate the following results 
with a little dog: 
') R. Maonus. Beiträge zum Problem der Körperstellung. II. Mitteilung Stell- 
reflexe beim Kaninchen nach einseitiger Labyrinthexstirpation. Pfliigers Archiv. 
Bd. 174, bldz. 134. 
*) J.G, Dussen pe Banenne u. R. Maonus: “Beitriige z. Probl. d. Körperstellung 
Ill. Die Stellreflexe bei der gross-hirnlosen Katze u. dem hirnlosen Hunde’. To be 
published in Pflügers Archiv. 1920. 
