APPENDIX III. 205 



10.6. None. 



10.8. Trace of iodine. 



10.10. Very marked iodine. 



10.15. Very marked. 



So that one grain of iodide of potassium in one 

 ounce of water was detected in the urine in twelve 

 minutes, and was very marked in fourteen minutes. 

 Iron was detected once in seven minutes and twice 

 in ten minutes, and it was very distinct in fifteen 

 minutes. 



Professor Mulder also made many experiments 

 on this patient, but I am unable to find any account 

 of his results. 



In the Medical Gazette for 1845, pp. 363 & 410, 

 Mr. Erichsen gives some experiments he made on a 

 boy of thirteen who had an open bladder. He 

 states that twenty grains of ferrocyanide of potas- 

 sium were detected in one minute in the urine. 

 The stomach was fasting, and the salt was dissolved 

 in three ounces of water. Forty grains taken three 

 quarters of an hour after a full meal were only 

 detected after thirty-nine minutes. 



Forty grains in four ounces of water were twice 

 detected in two minutes, and no trace could be 

 found after twenty- four hours; once in two minutes 

 and a half; once in six minutes and a half ; once in 

 fourteen minutes ; once in twenty-seven minutes ; 

 and once in thirty-nine minutes. 



Twenty grains of ferrocyanide he once detected 

 for twenty-eight hours. 



It follows from these experiments that ten grains 

 of carbonate or chloride of lithium, taken two and 



