On Kreatinins. 505 





Yolume of 



Weight of 



Weight of 





urine. 



1st Hg. ppt. 



2nd Hg. ppt. 





e c. 



grams. 



gvams. 





1790 



5 355 



9-076 





1360 



9-238 



9 930 



„ 31 to January 1 



1575 



7-300 



8-758 





1230 



6 715 



8-176 





1700 



4-985 



8-932 





1275 



7-735 



7 '955 





8930 



41 -328 



52 -827 



Hence it appears that the mercury salt of the reducing base is far 

 more constant in quantity than the amorphous mercury-compounds 

 first precipitated. Also in my case the average weight of hreatinin 

 passed in twenty-four hours amounted to 177 grams, or 25/1000000 

 of the body-weight. 



Analysis of the Spherical' Mercury Salt from Urine. 



As precipitated from urine, the spherical mercury salt has a fawn 

 colour, due to enclosure of urinary colouring- matter. It was there- 

 fore deemed advisable to re -precipitate the compound in order to obtain 

 it pure for analysis. With this object in view, the thoroughly washed 

 compound is suspended in water and subjected to a stream of hydrogen 

 sulphide until completely decomposed. The deep yellow filtrate from 

 the mercuric sulphide is digested for some days with purified animal 

 charcoal (which must be quite free from lime salts), and is then mixed 

 w T ith solutions of sodium acetate and mercuric chloride. A very pure 

 compound is obtained, if the decolourised solution is largely diluted 

 before adding the mercuric chloride, in which case any precipitate 

 which forms at once may be separated by filtration, after which the 

 filtrate gradually deposits the pure spherical compound in a colourless 

 condition. Having been washed with cold water and dried in vacuo 

 over sulphuric acid, the pure mercury salt was analysed with the 

 following results : — 



By Combustion ivith Copper Oxide. 



(a.) 1-1920 gram of the Hg salt gave 0']500 gram of H.,0. 



and 0-3755 „ C0 2 . 



Equivalent to 0*01666 gram hydrogen. 



and 0-10241 ,, carbon. 



tt tt i l. i • f hydrogen, 1 '39 per cent. 

 Hence Hg salt contains < J , 6 _ F 



L carbon, 8'o92 



