202 APPENDIX III. 



lithium, but if the urine is slightly concentrated by 

 evaporation, lithium is still perceptible. 



In eight days one-eighth of an ounce evaporated 

 still shows slight traces. 



In nine days no lithium in one-eighth of an 

 ounce of urine. 



Experiment 7. The same boy took five grains 

 of carbonate of lithia, but he omitted previously to 

 empty his bladder. 



In five minutes, lithium not yet detectable in the 

 urine. 



In ten minutes lithium very distinctly present in 

 one drop of the urine. 



Four days afterwards traces of lithium still in 

 the urine. 



Five days afterwards slight traces in one-eighth 

 of an ounce of urine when evaporated. 



In six days afterwards no lithium perceptible in 

 the urine. 



Experiment 8. Twenty-five grains of chloride 

 of lithium were dissolved in one gallon of water, 

 and the feet and ankles of a man were kept in the 

 solution for two hours ; at the end of this time the 

 urine was passed and examined for lithium, and no 

 trace could be found in the aqueous extract of the 

 ash of one quarter of an ounce of urine. 



These experiments agree very closely with some 

 which I made many years since on a full-grown 

 German who had an open bladder, admitting the 

 urine to be caught as it came from the kidneys. 



Feb. 24, 1852. At 8.45 A.M. he took two cups of 

 black coffee and nothing else. 



