352 MY RSINEZ. 
In order to determine the molecular formula, compounds of 
silver and lead with embelicacid were examined. In preparing ~ 
the metallic salts of embelic acid, as the acid is insoluble 
in water, alcoholic solutions neutralized with ammonia—any 
excess of ammonia being driven off by prolonged boiling— 
were mixed with hot alcoholic solutions of silver and lead. 
The resulting precipitates were allowed to subside, washed ~ 
with water by decantation, thrown on a filter and washed 
with alcohol, then with ether, thirdly with water, and finally 
again with alcohol and ether. The precipitates were very 
difficult to wash, owing to caking, and during the operation a 
certain amount of decomposition appeared to occur, Thus, in 
preparing the lead and silver salts, after mixing the solution 
of embelic acid with an excess of the metullic solution, the 
supernatant liquid, when the precipitate had subsided, was 
colourless ; but on washing the precipitate with alcohol and 
ether, the filtrate was coloured yellow, and after prolonged 
washing with water, the filtrates aftorded evidence of the pre- 
sence of silyer or lead, and then when alcohol and ether were 
used for the final rinsings the filtrates were again coloured 
yellow. 
Ignition of the silver salt, after having been dried at 100° C5 
indicated that it contained 40°653 per cent. of the metal, which 
gives 264-9 as the molecular weight of the salt, and 158 as the 
molecular weight of the acid, the acid being represented by 
the formula HC9H'%0%. The silver salt would have the for- 
mola AgO°H'*0*, which requires the following theoretical 
percentage ake 
ar ig cid 41-432 
Hydrogen ... te 4987 
Silver re 417302 
Oxygen 12°279 
The composition of the salt as determined by analysis 
asia ae following perconinays © = 
| we 41544 
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