On Kreatinins. 



507 



(6.) 0*8232 gram of Hg salt gave 0*5356 gram of AgCl, equivalent 

 to 0*1325 gram of chlorine. 

 The salt therefore contains 16*09 per cent, of chlorine. 



The empirical formula derived from the results of these analyses is 



C 16 H 28^12°6 H g7 C1 10- 



The simplest rational formula is 4(C 4 H" 6 HgN 3 0-HCl)-3HgCl 2 -2H 2 0. 



Theory. Found. 



8-588 ( «« 



{ 



Hydrogen... 1-251 .... 1*325 j \ 



Nitrogen.... 7*503 .... 7*275 j l\ 



Oxygen 4*288 4*247 (By difference) . 



Mercury .... 62*528 .... 62*560 j ^33 



•39 

 •26 

 26 

 28 



Chlorine 



15-855 .... 16*005 { 



100*000 100-000 



The apparent molecular weight of the mercury salt (confirmed 

 subsequently) is 2239, and it contains 20*19 per cent, of the bape 



c 4 H 7 isr 3 o. 



The crude spherical mercury salt, as obtained directly from urine, 

 yielded on combustion — 



Carbon, 8*46 per cent. 

 Hydrogen, 1*17 „ 



Preparation and Properties of the Hydrochloride of the Reducing Base 



of Urine. 



In order to prepare the hydrochloride of the reducing base of urine, 

 the crude spherical mercury salt is suspended in water and completely 

 decomposed by hydrogen sulphide. The deep yellow acid filtrate 

 from the resulting mercuric sulphide is then decolourised as completely 

 as possible by very pure animal charcoal, and the nearly colourless 

 filtrate from the charcoal is left to evaporate spontaneously in vacuo 

 over sulphuric acid. Large well-formed prisms with pyramidal apices 

 separate out, which only need washing with a little strong alcohol to 

 separate a small quantity of dark tarry matter, which usually adheres 

 to the bottom of the vessel. They need no re-crystallisation. 



This ready crystallisation of the hydrochloride of the reducing base 

 is doubtless due to the great purity of the mercury salt which is 

 attained by separating the amorphous compounds first precipitated 

 from the urine by mercuric chloride by immediate filtration. 



I have worked Maly's process (vide supra) exactly as he directs, 



