Observations ou the structure of tlie central fovea of the huniau eye. 23 



iiitenia is not well marked, owing to the fact that the inner surface 

 has become slightly frayed near the centre. The photographs are 

 not as clear as might be desired and fall short of the sections from 

 which they are taken, but most of the statements in the text can 

 be verified upon them. Their details may be followed out more easily 

 if they are compared with the diagram on p. 11. The magnification 

 is as follows: 



Fig. 1 24 diameters 



Fig. 2 42 diameters 



Fig. 3 . . . 130 diameters 



Fig. 4 180 diameters. 



