Dr. Ronalds on Sulphur and Phosphorus in Urine. 255 



acid and filtration, each consisting of four fluid ounces, were 

 measured ; the one simply evaporated and burnt, the other 

 evaporated and afterwards deflagrated with nitre. Each por- 

 tion was then dissolved in dilute nitric acid, leaving a minute 

 insoluble residue, and the sulphuric acid precipitated by 

 chloride of barium; the results were as follows: — 



Four fluid oz., simply incinerated, gave Four fluid oz., deflagrated witii 



grs. gr. nitre, gave in grains 



BaO SOg 2-656 = SO3 0-902 BaO SO3 5-697 = S03 1=954 

 = S 0-366. =S 0-783 



The quantity of sulphur in four fluid ounces not excreted in 

 the state of sulphate was therefore 0-417 grain. To ascertain 

 the quantity of sulphur excreted by the urine in twenty-four 

 hours in an unoxidized state, the whole quantity jjassed by 

 three individuals during that time v/as collected on different 

 days and measured ; its specific gravity was taken, and after 

 being filtered from mucus, two portions of each specimen were 

 measured in a specific-gravity bottle containing 1000 grain 

 measures; one portion was simply acidified with nitric acid, 

 and the sulphuric acid precipitated by nitrate of barytes. The 

 other portion was evaporated with nitre and deflagrated, and 

 the fused mass treated with dilute nitric acid and nitrate of 

 barytes. From the difference in the quantities of sulphate of 

 barytes obtained, the amount of sulphur not in an oxidized 

 state was ascertained. The results from five different experi- 

 ments are shown by the following table. 



Table, shov/ing the relative proportions of sulphur free and 

 combined with oxygen excreted by the kidneys in twenty- 

 four hours. 



It thus appears that from three to five grains of sulphur 

 pass off" daily by tlie urine iu some other combination than as 



