THE EETINA 



ISOLATING the retina from the other tissues 

 requires considerable patience and dexterity. 

 When the retina has been removed and placed 

 in a special receptacle, it will be found 

 that the specimen is well worth the little 

 amount of time spent in making it. Previous 

 techniques, even the writer's own, sometimes 

 took nearly two hours to do, and rarely was 

 the retina isolated without puncturing or tear- 

 ing it; perfect specimens were almost impossi- 

 ble. The following method will assure one of 

 success in nearly every instance. Failures are 

 almost impossible. Punctures, perforations, 

 tears, etc., are rare. The beginner should 

 isolate the retina in about six to seven min- 

 utes; the expert in about four and a half to 

 five minutes. 



Select an eye with a long optic nerve, and 

 prepare it for this dissection by placing it in 

 a 10 per cent, solution of formaldehyde for 



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