A. J. Carlson 347 
regained during the resting state of the cell. But so far there seems to 
be no decisive evidence in favor of the one or the other explanation. 
EXPLANATION OF FIGURES, PLATE I. 
Retina, Brandt cormorant. Stains: erythrosin and methylene blue ac- 
cording to Held. 1. Ganglionie layer. 2. Bipolar cell layer. 
Fie 1. a. Bipolar and ganglion cell layers from resting retina. 6. Same 
from stimulated retina. Camera, % objective. 
Fie. 2. a. Bipolar and ganglion cell layers from resting retina. 6. Same 
from stimulated retina. Camera, 24 objective. 
Fig. 3. a. Ganglion cell from resting retina. 6. Same from stimulated 
retina. ,/, oil immersion. 
Fie. 4. a. Ganglion cell from resting retina. }b. Same from stimulated 
retina. 1, oil immersion. 
