TECHNIQUE OF EYE DISSECTIONS 



three minutes. Longer than that time will 

 cause the lens to be put out of shape, and make 

 it so fragile that it can no longer be handled 

 without having it fall apart. If the lens comes 

 from an unhardened eye it might be best to 

 boil it not more than about two minutes. 



Fig. 19 Showing the way the onion-like layers of 

 the lens may be peeled off. 



Insert the point of the scalpel carefully at 

 one of the poles, and lift gently in the direc- 

 tion of one of the radiating lines. This will 

 tend to raise one of the concentric layers, 

 which can be easily peeled off. Eepeat this in 

 the direction of the other two radiating lines. 

 Examining, with a hand lens, the exposed sur- 



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