118 



Mr. E. Scliunck on the Colouring and 



[Eecess_, 



This formula represents a substance containing several atoms more water 

 than the extractive matter soluble in ether^ the composition of which was 

 arrived at by Analysis III. Series A. The tendency to absorption of water 

 by this body was already indicated by iinalysis I. of the present series. Here 

 it has taken place to a still greater extent^ and has probably attained the 

 extreme possible limit. The absorption of water in this instance I was at 

 the time inclined to attribute to the evaporation of the solutions containing 

 the extractive matters having been conducted at a higher tem.perature than 

 before. I now think it more probable that it was due to the length of time 

 daring which the lead precipitate v/itli amm.onia was kept in contact with 

 water. 



The syrup'like matter insoluble in alcohol and ether {e) and that inso- 

 luble in ether alone (/) were mixed together and treated with alcohol. 

 After standing for some time the liquid was poured off from some glutinous 

 substance {g), which was left undissolved, and evaporated. The residue 

 left on evaporation was treated with warm absolute alcohol, which dissolved 

 the greatest part of it. To the solution there was added a little acetate of 

 lead, and after being filtered from the precipitate it gave, with an excess of 

 alcoholic lead solution, an abundant precipitate, which after being treated 

 in the usual manner was analyzed. 



VI. 0*8800 grm. of this precipitate gave 0"7235 grm. carbonic acid and 

 0-2335 grni. water. 



1*4885 grm. gave 0*3300 grm. chloride of platinum and ammonium. 



0-2160 grm. gave 0*1415 grm. sulphate of lead. 



In 100 parts it contained therefore 



C 22-42 



H 2-94 



N 1-39 



O 25-05 



VhO 48-20 



100-00 



The substance combined with oxide of lead contained, in 100 parts, 



C 43-28 



Bl 5-69 



N 2-68 



O 48-35 



100-00 



The glutinous substance {g) left undissolved by alcohol was treated with 

 water, and the resulting dark-brown solution was filtered from some undis- 

 solved gelatinous matter and agitated with oxide of mercury, which took 

 up a great deal of the colour, leaving the solution of a pale yellow tint. 

 After filtration sulphuretted hydrogen was passed through it in order to 

 precipitate the mercury in solution, and after being again filtered it was eva- 

 porated, when it left a pale yellow amorphous residue. This was treated 



