THE PROPER TISSUE OF THE CORXEA ; CORXEAL TUBES. 411 



injected mass does not form the long spearhead-like figures, 

 but irregularly contoured broad spots, connected with each 

 other by slender bridges. At the periphery of the puncture- 

 injection such spots often appear completely isolated, or are 

 only connected by very slender processes ; or they may be 

 joined by broader bridges, and then form an irregular plexus, 

 which is distinguishable from those parts, when the injection 

 is more complete, leaving only small interspaces between the 

 communicating spots by its larger meshes. 



In. the injected cornea many layers of such plexuses are 

 superimposed one upon the other. 



When the plexus presents large meshes, the injection not 

 being complete, figures occur like those that have been depicted 

 by C. F. Miiller* and Schweigger-Seidelf in the Dog and 

 Guinea-pig. It is only in. certain limited parts, however, that 

 they exhibit exactly the characters that they have illustrated. 

 Whether in such plexuses so regular a distribution of nuclei 

 can be demonstrated by logwood tinting, as C. F. MiillerJ and 

 Schweigger-Seidelf give, I am unable from my own observation 

 to state. I have never been successful in seeing such images, 

 though it is possible they may be sometimes visible. They are, 

 however, of no special value in enabling an opinion to be formed 

 in respect to the structure of the cornea. The statement made 

 by C. F. Muller,j| and which may also be deduced from a passage 

 in Schweigger-Seidel's essay,^[ to the effect that in the cornea 

 of the same species of animal elongated lance-like figures come 

 into view in one case, and in another plexuses, according to the 

 force with which the injection is driven, must be called in 

 question. I am certainly of opinion that it is not accurate ; for 

 in the first-named animals lance-like shapes are always present, 

 whilst in the Dog and Guinea-pig there are always plexuses. 



It is of much greater importance to demonstrate what lesion 

 of continuity has been caused in the corneal tissue by the 



* Loc. cit., fig. 1. 



t Loc. cit., figs. 13 and 14. 



J Loc. cit., fig. 1. 



Loc. cit., fig. 14. 



|| Loc. cit., p. 138. 



IF Loc. cit., pp. 316 and 317. 



