THE CHOEOID 



SELECT an eye that has had a long part of 

 the optic nerve left on it and place it into a 

 5 per cent, solution of formaldehyde. Leave 

 it in that solution for from, two to three 

 weeks. That period of time in the fluid will 

 be sufficient to permit the choroid to become 

 sufficiently toughened and hardened. Leaving 

 it in the solution longer than that length of 

 time will not injure the eye in any way. 



After having removed the eye from the 

 formaldehyde, wash it for a few moments in 

 running water. This will remove the preserv- 

 ing and hardening fluid from the surface, and 

 will save the hands a little from the effects 

 of the fluid. Next remove all the muscles 

 and fatty tissues from the sclerotic. After 

 that has been done, puncture the cornea with 

 the pointed jaw of the scissors about 2 mm. 

 from the corneo-scleral junction. (Fig. 22.) 

 Then proceed to cut the cornea away, being 



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