CRYSTALLINE CONSTITUENTS OF OPIUM. 203 
Experiment. Calculation. 
SS 
Carbon, . : : : 33°02 33°47 Cy, 240 
Hydrogen, S c c 3°21 2-92 H,, 21 
Nitrogen, 3 - - coe 1:95 N 14 
Oxygen, c ate 8-95 0, 64 
Todine, “ 4 - 52:90 62°71 I, 378 
100-00 717 
The formula of the substance is therefore 
C,, H,, NO, + I,. 
Pentiodide of Papaverine.—By evaporating the mother liquor of the teriodide 
this compound is deposited, and is purified from excess of iodine by crystalliza- 
tion from alcohol. It then forms slender needles, with an orange colour by trans- 
mitted light, and a reddish-bronze surface colour. It is much more soluble in 
alcohol than the teriodide, but is insoluble in water. It loses iodine by the ap- 
plication of a moderate heat, although perfectly stable at 212°. It is insoluble in 
acids, and is rapidly decomposed by ammonia. Its composition was :— 
5000 ... carbonic acid, and 
1:283 ... water. 
3902 grains pentiodide gave 
4665 ... iodide of silver. 
{500 grains pentiodide of papaverine gave 
Experiment. Calculation. 
SS 
Carbon, : é : : 24°78 24-76 C,, 240 
Hydrogen, . F . : 2°59 2°16 H,, 21 
Nitrogen, . 7 3 : at 1:44 N 14 
Oxygen, ‘ < é : cae 6°63 0, 64 
Todine, : 3 : ‘ 64:60 65-01 I, 630 
100-00 969 
These results give the formula 
Cy Hi, NO, i I, 
It is difficult to form a rational conception of the constitution of these sub- 
stances. The formule given above seem to be on the whole the most probable; 
but it is clear that the analyses admit of a different interpretation, and we may 
assume these compounds to be hydriodates with excess of iodine, and represent 
their constitution by the formulze 
C,, H,, NO, HI + I, 
Cae eNO er sh, 
the additional atom of hydrogen making too small a difference to be important. 
We have, however, no experiments to enable us to decide between these two 
views, which could only be done by an extended investigation of the similar com- 
pounds of the other bases; and in the absence of further information, I have 
VOL. XXI. PART I. ! 31 
