222 Dr. Bence Jones on the Rate of Passage, S$c. [May 4, 



Two grains of chloride or carbonate of lithia, taken shortly after food by 

 a boy, gives no appearance 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 protoxide of iron, taken by a man almost fasting, 

 gave a trace in the urine in seven minutes. Seven grains gave distinct 

 appearance in ten minutes ; and in ten minutes and a half one grain of iodide 

 of potassium, taken by the same man fasting, appeared in the urine in 

 twelve minutes. 



When no lithia had been taken, seven cataracts were examined most 

 carefully, and only one showed an exceedingly feeble trace of lithium. 



When twenty grains of carbonate of lithia were taken twenty-five minutes 

 before the operation, the lens showed no lithium. 



When twenty grains of carbonate of lithia were taken two hours 

 and a half before the operation, the lens showed lithium in the watery 

 cataract. 



When twenty grains of carbonate of lithia were taken between four 

 and five hours before the operation, the lens showed lithium in each 

 particle. 



When twenty grains of carbonate of lithia were taken seven hours before 

 the operation, the lens showed lithium in each particle. 



When twenty grains of carbonate of lithia were taken seven days before 

 the operation, the lens showed not the slightest trace of lithium. 



Twenty grains of carbonate of lithia, taken between six and thirty-six 

 hours before death, showed the faintest indications of lithium in the lens. 

 The cartilage showed lithium very distinctly. 



Ten grains of carbonate of lithia, taken five hours and a half before 

 death, gave only faint traces of lithium in the lens, but the cartilage showed 

 lithium very distinctly. 



5. On the Presence of Lithium in Solid and Liquid Food. 



Potatoes showed traces of lithium once in five trials. 

 Apples showed traces of lithium thrice in four trials. 

 Carrots showed no lithium in two trials. 

 Bread showed traces of lithium thrice in three trials. 

 Cabbage twice in two trials. 



Tea ,, eight times in ten trials, 



Coffee ,, four times in five trials. 



Port wine six times in six trials. 



Sherry ,, six times in six trials. 



French wine four times in four trials. 



Rhine wine eight times in eight trials. 



Ale ,, ,, twice in three trials. 



Porter twice in three trials. 



