212 
HENRY LAURENS AND S. R. DETWILER 
The halves of the upper jaw containing the eyes were allowed 
to remain in the fixing fluid for an hour, in light or darkness, 
respectively, without being disturbed. After the expiration of 
this time, they were carefully dissected out and dropped into 
Fig. 1 Diagrammatic drawing of sagittal section of the epithelial pigment 
layer. The guanin is indicated by the lightly stippled, the melanin by the heavily 
stippled area; the choroid is shown by horizontal lines. X 11. 
fresh fixative, where they remained from four to five hours 
longer. Sagittal and horizontal sections 10/x thick were made, 
stained in eosin and toluidin blue, iron haematoxylin and eosin, 
or in EhrUch's haematoxylin and eosin. All methods yielded 
good results. 
