Observations on tlic stiiicture (if tlie centrili fovea of the Ininian eye. 5 



das wirkliche Centrum der Fovea." Tliis does not profess to be a 

 diagram but an actual representation of a frozen section. In general 

 form it closely recalls the representation given by Hiilke. Th('. fovea 

 is shown as a conical depression, deep, with steep convex sides; the 

 apex or bottom of the fovea is rounded; the limitans externa dips 

 slightly towards it, much less than in Schultze's diagram. The cones 

 over this depression are longer in the middle than at the sides, so 

 much so that the line joining their outer ends is even somewhat 

 bulged. This author agrees with Müller, Schnitze and nearly all other 

 observers in representing the cones as more slender over the middle 

 of the fovea than elsewhere, 

 but he makes them pass ab- 



■•• ,, ' ■Jflfi'iä 



ruptly into thicker cones , Ii'^!' r' 



'I ll ■ ■■■ "' • •- 



about half way up the decli- n|(i|i 



vity of the external depres- 

 sion. Here also cone -nuclei , ^ .f 

 are represented throughout 

 close to the limitans externa, 

 but the deeper ones are less 



closely packed at the fovea ^^^Sè^^^ 



than at its margin. The cone- Fig- 2- Central fovea according to W. Krause. 



fibres are again delineated 



as mere lines. The inner nuclear layer is seen to be separated every- 

 where by a thick inner molecular layer from the ganglionic layer and 

 it also terminates sooner than the last mentioned layer, which is re- 

 presented as if continued nearly to the centre of the fovea. The 

 ganglion-cells are represented large and round. At the very bottom 

 of the fovea "the inner retinal layers are replaced by hyaline stellate 

 cells and radial fibres (fibres of Müller); besides these there are here 

 present only the cone and cone-fibre layers." To this it may be added 

 that the cone-fibre layer in Krause's figure is at this part nothing but 

 a small mass of cone-nuclei. 



Kuhnt (1881)^) made a special study of the fovea in three normal 



Sitzungsbericht der ophthalmol. Gesellschaft in Heidelberg. 1881. 



