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labyrinth, with tho various positions of (he head in space consequent 

 on the varying intliience of the otoliths of the unimpaired side, but 

 that these phenomena are constantly the same whatever the position 

 of the head of the animal under examination may be, when it is 

 held up freely in the air. 



Five simiiai- experiments were made, which are instanced in the 

 following three protocols: 



Cavia R: 



28/6 1921 : All labyrinth-reflexes normal. 



Gentrifugalion : head up, chest inward, time 2 minutes, rate 1000 m. 

 per minute. 

 2/7 1921: Total lack of tonic reflexes. 



4/7 1921 : Reflexes of the semi-circular canal : rotation-reactions towards the 

 right positive, to the left weak. 

 Progression-reactions: doubtful or lacking. 

 Total lack of tonic reflexes. 

 5/7 1921 : Reflexes of the semi-circular canal (also progression-reactions) all 

 present and symmetrical. 



Tonic reflexes: all present. Sits symmetrically, no eye-deviations. In 

 dorsal position with head in normal position to the trunk : no distinct 

 difference of tonus in the extremities. 



llh 39'. 0.1 cc of 5% cocain solution into left middle-ear. 



llh 41'. Held up in the air with head down: head 90° towards the right. 

 When silting D ') down S 2) up (consequently stimulation of the 

 left labyrinth). 



11^43'. Head down: head symmetrical again. 



llh 47'. Head down: head 20—80° rotation to the left, slightly turned to the 

 left. When sitting a slight levoversion of the head, no distinct eye- 

 deviations. 



llh 49'. Head down, 45° levo-rotation. When sitting falls on the left side. 

 Head in normal position: no distinct difference of tonus in the 

 extremities. If moved on the grouna to the right much greater resi- 

 stance then against moving to the left, strong inclination to the left 

 (incipient paralysis of the left labyrinth). 



11*151'. Head down: 70° levo-rotation. When sitting head-nystagmus towards 

 the right. Is moved on the ground: rolling to the left. No distinct 

 eye-deviation. 



11^54'. Head down 90° levo-rotation. OS slightly downwards. OD upwards. 



12h. S weak nystagmus beats anteriorly upwards. D posteriorly down- 



wards. No change of the phenomena with a change of the position 

 of the head in space. 



12h 3'. Marked spontaneous nystagmus, direction as at 12h. 



12h 6'. Marked deviation and nystagmus, do not change with a different 

 position of the head in space. 



^) D means Right eyeball. 

 3) S means Left eyeball. 



