gS Neurological Technique 



specimen should be changed from time to time to prevent flat- 

 tening or distortion. 



2. Drain the specimen for 2 or 3 minutes, and place it in 

 95 per cent, alcohol for 5 or 6 hours. 



3. Then place in a glass vessel containing the preserving 

 fluid (B). Here it remains indefinitely. 



Even in the preserving fluid it is advised to keep the prepa- 

 ration in the dark as much as possible, since the long duration 

 of light seems to cause it to lose its natural color. 



When on exhibition or in use for study or demonstration, the 

 preparation may be improved in appearance by placing it in 80 

 per cent, alcohol for the time being. This seems to brighten 

 the colors to a certain extent. Too long duration in alcohol, 

 however, will extract the color. 



The preparation is well adapted for dissection. If dissec- 

 tion is made, it is suggested that it should be delayed till after 

 the specimen has been in the preserving fluid for about two 

 weeks. 



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