APPENDIX III. 207 



examined ; no trace of lithium could be found in 

 either lens. 



Experiment 2. The hard cataracts from two other 

 patients who had no lithia water were examined ; an 

 aqueous extract of each lens was made ; one showed 

 the most excessively feeble lithium line ; the other 

 lens did not give the slightest indication. 



Experiment 3. The hard cataracts of two other 

 patients who had taken no lithia water were 

 examined ; the alcoholic extract of the ash, after 

 treatment with sulphuric acid, showed no lithium in 

 either lens. 



The lens of a third patient was examined when 

 no lithia water had been taken, and the alcoholic 

 extract showed no lithium. 



Experiment 4. The lens of a man aged seventy 

 was extracted twenty-five minutes after he had taken 

 twenty grains of carbonate of lithia in water on an 

 empty stomach; no lithium could be detected in 

 the lens. 



Experiment 5. A woman, ast. sixty-four, at 9 A.M. 

 took twenty grains of carbonate of lithia in water ; 

 both lenses were extracted at 11 J A.M. the same 

 day. Neither of the lenses showed any lithium 

 when touched with a red-hot wire, but the aqueous 

 extract of one lens showed lithium faintly, and the 

 aqueous extract of the other lens showed lithium 

 distinctly. 



Experiment 6. An eye was removed three hours 

 after twenty grains of carbonate of lithia had been 

 taken ; the lens was removed half an hour after- 

 wards, and on examination every portion of the lens 



