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 ••• cai-bonic acid, and 

 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 

 9 58 ••• 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 

 6-140 ••• iodide of silver. 





No. 1. 



No. 2. 





No. 3. 



Carbon, 



. . 3-48 



lost. 





3-204 



Hydrogen, 

 Oxygen, . . 

 Iodine, 







0-417 

 92-060 





0-471 



4-440 



91-885 





100-000 



100-000 



100-000 





Mean. 



. 3-337 



Calculation. 





Carbon, 



3-258 



C 6 



36 



Hydrogen, 

 Oxygen, . . 

 Iodine, 



. 0-444 

 . 4-247 

 . 91-972 



0-364 



4-344 



92-034 



I, 



4 

 48 



1016*8 



100-000 



100-000 



1104-8 



The formula is therefore C G H 4 I 3 6 . 



