56 ON A METHOD OF SUBSTITUTING IODINE FOR HYDROGEN, &c. 
it is deposited as a perfectly amorphous mass. Unfortunately, the iodine is re- 
tained with a very feeble affinity, and I have found that at every crystallization, 
a small quantity is separated and remains in the fluid, so that results of a satisfac- 
tory character could not be obtained on its analysis. It is soluble in hydrochloric 
acid, and if the solution be made hot, it deposits at first an oily substance, 
which aftewards concretes to a flocky mass. Both ammonia and potash precipitate 
it from its solution in hydrochloric acid, the former giving a slightly coloured 
substance. With chloride of platinum it yields a bright yellow precipitate, one 
determination of the platinum in which gave 12-20 per cent.; 11-95 corresponds 
to the formula, C,, H,, 1, NO, HCl PtCl, + HO., which represents the hydrated 
salt of a base, which may be called di-iodocodeine, as being derived from codeine 
by the substitution of two atoms of iodine for two of hydrogen. 
These experiments were conducted in the laboratory of Professor ANDERSON, 
to whom I am much indebted for assistance during their prosecution. 
