54 ON A GENERAL METHOD OF SUBSTITUTING 
and brilliant lustre, and having an odour resembling that of saffron. It is inso- 
luble in water, soluble in alcohol, especially on boiling, and in ether. It is inso- 
luble in hydrochloric acid, and may be boiled with that reagent, without suffering 
decomposition. Strong nitric acid attacks it with great violence, but does not 
effect a complete oxidation of all the iodine. It is unacted on in the cold by strong 
sulphuric acid, but if heated, it is decomposed with the liberation of iodine. 
Caustic potash when long boiled with it, removes a very small quantity of iodine. 
It does not affect litmus paper, and seems to possess neither acid nor basic pro- 
perties. It sublimes unaltered at a temperature greatly below that of boiling 
water. 
These characters closely approximate to those of iodoform, and I at first con- 
sidered it to be that substance. The analysis, however, made with every care, 
and on specimens prepared at different times, gave results which cannot be made 
to agree with the formula of that substance. 
The analysis are as follows :— 
No. 1, 7:141 grains substance, air-dry, gave 
0:913 --- carbonic acid, and 
ooo water. 
No. 2. 4:365 grains substance, air-dry, gave 
carbonic acid, and 
0: 164 ++ water. 
No. 3. 8:153 grains substance, air-dry, gave 
0:958 --- carbonic acid, and 
0:346 --- water. 
No. 1. 5:697 grains substance, air-dry, gave 
9-706 --- iodide of silver. 
No. 2. 3°611 grains substance, air-dry, gave 
6140 --- iodide of silver. 
No. 1. No. 2. No. 3. 
Carbon, . .. . 348 lost. 3°204 
Hydrogen, . . - °... 0-417 0°471 
Oxyrens ctu Pere eer 394 4-440 
OCC? oe 8 3 eine 92-060 91-885 
100-000 100-000 100-000 
Mean. Calculation. 
——— 
Carbon, . : . 3°337 3258 C, 36 
Hydrogen, . . 0-444 0:364 H, 4 
Oxygen, SMe), are eas, 4:344 OF 48 
Totines 5 5, = 912972 92-0384 i 1016°8 
100-000 100:000 1104:8 
The formula is therefore C, H, I, 0,. 
