128 THE ALKALOID FROM PITURIE. 
Platinic chloride does not precipitate an aqueous solution of the 
alkaloid (1:100 aq:) so long as the alkaloid is in excess, but when 
the solution has become neutralised, the addition of another drop 
ent 
platinie chloride. 
All the following tests were — with an aqueous solution of 
1 part of the alk aloid to 100 w 
Mercurie chloride, in the jacaile solution of the alkaloid throws 
down a white cheesy precipitate, insoluble in an excess of the 
precipitant, easily soluble in hydrochloric acid; on heating to 
boiling the precipitate softens, but does not actually melt ; it par 
difficultly ae in boiling water; on cooling it is 
in an amorpho Le. 
A few drops eb mercuric chloride give a white precipitate i F 
solution of the hydrochloride, which disappears on eer os 
when the mercuric chloride is in excess, a W te crystals 
precipitate is thrown down, which is rather easily soluble in 
water; on coolin ng, agen stals in the a sro per oa 
light green precipitate, insoluble in an excess of 
a solution of the hydrochloride the copper sulphate ioe a 
produce any change. ution 
few drops of gold chloride added to the aa shaking * 
give a reddish white precipitate, rae martes idish vaehite 
larger quantity of the re-agent gives a acid with 
precipitate, which is persistent, soluble in “hoch 
‘ops of gol 
fe pa solution of the hydrochloride a few ae 
chloride give a reddish-white precipitate, eo ria 
i eagent gives 
 Tannic acid giv pri ses 7 precipitate se eo ee 
solu ie cay iclitle in hydrochloric acid. : 
