404 THE CORNEA, BY ALEXANDER ROLLETT. 



humour, whilst the silver figures exhibit a closely interwoven 

 plexus.* v. Recklinghausen,t by staining with carmine, has 

 demonstrated in silvered preparations the presence of red 

 scales in these cavities, which sent forth processes into one 

 part of the plexus, whilst another part of the plexus was 

 empty, or only contained small red-coloured and rather 

 lustrous granules. These scales and their processes and the 

 red granules are the remains of the protoplasmic plexus of 

 the cornea, which in silver preparations may be preserved in 

 very different stages of change. 



Fig. 384. 



Fig. 384. Preparation taken from the cornea of a Frog, treated with 

 nitrate of silver. 



It is of very great importance for the proper understanding 

 of the appearances presented in silver preparations of the 

 cornea, that the successive action of the salt on the tissue 

 should be followed from its very commencement. The best 

 means for this purpose is to treat cornese silvered in a solution 

 containing one part by weight of nitrate of silver in 200 of 

 water, with a solution of chloride of gold containing 0'5 part 

 by weight in 100 parts of water. 



* v. Recklinghausen, see this Manual, Vol. i., p. 314. 

 f Die Lymphgefasse, p. 38. 



