206 APPENDIX III. 



a half, three, or four hours after food by a man, 

 require between five and ten minutes to pass from 

 the stomach to the urine, and this quantity of 

 carbonate or chloride of lithium will continue to 

 produce traces of lithium in the urine from six to 

 seven, or even eight days. 



Five grains of chloride or carbonate of lithia, 

 taken shortly after food by a boy, gives no appear- 

 ance in the urine until from ten to twenty minutes, 

 and this quantity continues to pass out for five, 

 seven, or eight days. 



Experiments made by the ordinary mode of 

 analysis showed that 



Four grains of sulphate of the protoxide of iron, 

 taken almost fasting by a man, gave a trace in the 

 urine in seven minutes. 



Seven grains gave distinct appearance in ten 

 minutes and ten minutes and a half. 



One grain of iodide of potassium, taken by the 

 same man fasting, appeared in the urine in twelve 

 minutes. 



Experiments on the Hate of Passage of Lithium into 

 and out of the Crystalline Lens. 



Through the kindness of Mr. Bowman and Mr. 

 Critchett at the Moorfields Ophthalmic Hospital, 

 lithia water, containing variable quantities of lithia, 

 was given to different patients about to be operated 

 on for cataract. 



Experiment 1. The hard cataracts from two 

 patients who had taken no lithia water were 



