270 DR. BENCE JONES ON THE VARIATIONS OF THE ACIDITY OF THE URINE. 
four hours no tartrate of potash was taken ; in the following seventy-two hours ten 
drachms of tartrate of potash were taken with a mixed diet, and for the next twenty- 
four hours no tartrate of potash was taken, and in the last twelve hours thirty grains 
of nitre were taken. 
PLATE XXIV. 
The comparison of the variations of the acidity of the urine when different diets 
were taken. 
PLATE XXV. 
The comparison of the variations of the acidity of the urine when sulphuric acid, 
liquor potassse, tartaric acid and tartrate of potash, and a mixed diet only, were 
taken. 
