THE ALKALOID FROM PITURIE. 129 
solution of the hydrochloride there is a greyish-white turbidity 
y, which disappears on the addition of hydrochloric acid. 
The double iodide of mercury and potassium (HgI,,2K1) gives 
a heavy white crystalline precipitate in the aqueous solution. 
Under the microscope this is seen to be made up of small plates 
arranged in stellate groups. With hydrochloric acid the pre- 
cipitate becomes yellow and pasty, but does not dissolve in the 
faa readily soluble on heating ; on cooling the solution becomes 
peers 
solves on heating; on cooling, it is redeposited as a yellow 
T. 
: On the addition of a small quantity of an alcoholic solution of 
iodine a yellowish turbidity only is imparted to the solution, which 
1s persistent for some hours; but a greater quantity produces a 
treating the alkaloid with concentrated sulphuric acid and a 
i te in powder, the fluid takes the colour 
of the bichromate ; after a time it changes to a dirty brown and 
then to green. When warm the change of colour takes place 
immediately, 
With manganese peroxide (MnO,) instead of the bichromate, 
no change takes place in the cold; when warm a faint violet 
colour is produced. 
The alkaloid behaves very like nicotine with picric, phospho- 
molybdic and metatungstic acids; the addition of picric acid throws 
down a yellow precipitate soluble in hydrochloric aci 
_ Phosph 
“ipitate, insoluble in cold dilute hydrochloric acid, easily and 
armin 
tine a 
white amorphous precipitate, soluble only in much dilute hydro- 
chloric acid when warmed. 
-fodine.—When iodine dissolved in ether is added to an etherial 
‘olution of the alkaloid the fluid becomes brownish red and 
mother liquor bein. : are easil luble in 
r Ligt g yellow ; these crystals are _ : 
alcohol, yielding a aia red obi ; when the a 
Ys 1S evaporated at the ordinary temperature, indistinc 
Reedles and oily drops are left behind. 
