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otolith membrane; the difference between this and fig. 2a., where a normal 
membrane is present, is clear. In fig. 8c. the sensory epithelium of the 
sacculus, without otolith membrane can also be seen slightly magnified, 
while the-torn off membrane lies in the corner of the sacculus. 
Right utriculus (Fig. 8d.) In this photo, more strongly magnified, the 
sensory epithelium of the utriculus can be seen covered with some fragments 
of the otolith membrane in granular form. (Compare fig. 2d. with normal 
otolith membrane). The torn off membrane itself was found in the posterior 
vertical semi-circular canal (Fig. 8e.). 
Left utriculus (Fig. 84): We see here, slightly magnified, the sensory 
epithelium of the left utriculus covered with a few granules. The torn off 
‘membrane was also in this side found in the posterior vertical canal (fig, 8g. 
with the posterior vertical and with the horizontal canals). 
Semi-circular canals with cristae quite intact. (The torn off 
otolith membrane in the posterior vertical canals). 
Thus here again is the most absolute agreement between the 
clinical and the pathologic-anatomical diagnoses. 
Three other cases, not described here, showed the same complete 
agreement between the clinical and the microscopical investigations. 
Pharmacological Institute of the Utrecht University. 
