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Dr. C. it. A. Wright's Contributions to the [Mar. 14, 



with excess of water and boiled for several hours, a further elimination of 

 the elements of HI has been shown to take place, the end product having 

 the composition C8 H 80 N 4 O 10 , 4HI ; as stated in Part III., however, it is 

 very difficult to push this reaction to its extreme. Precisely the same 

 facts are observable with the above morphia product ; by boiling this with 

 three hundred times its weight of water for three hours, half the basic 

 iodine it contains is eliminated as HI, forming a product which may be 

 either a mixture of equivalent quantities of C G8 H 8l I N 4 O 10 , 4HI and 

 C 68 H 80 N 4 O xo , 4HI, or a single substance of the formula 



C !M H M IN 4 O 10> SHI. 



If this latter be the case, the formulae hitherto attributed to the derivatives 

 from codeia and morphia obtained by the action of HI are only half the 

 true ones ; and the formation of this substance may be expressed by the 

 equations 



C 136 H 164 1 4 N 8 O 20 , SHI = 2HI + C 136 H 162 1 2 N 8 O 20 , SHI, 

 C 138 H 162 I 2 N 8 O 20 , 8H I= HI + C 136 H 161 IN s O 20 , 8 HI. 



The following considerations tend to show that this body is a single sub- 

 stance and not a mixture : — 



1st. By treating the compound hitherto described as C U8 H 81 1 N 4 O 10 , 4HI 

 from codeia with water, a body which has the composition of 



C 136 H 1H IN 8 O 20 , SHI 



is produced previously to the production of the substance hitherto described 

 as C 68 H 80 N 4 O 10 , 4HI. Now it is not probable that in two separate in- 

 stances one compound should split up into mixtures of two bodies of ana- 

 logous though slightly different constitutions, these two being formed in 

 each case in equivalent quantities. 



2nd. A body which is without doubt a single compound, and which has the 

 formula C ]36 H 153 1 N 8 O 20 , 8HI, has been produced (as will be described in 

 a subsequent communication) by the simultaneous action of HI and P on 

 a polymeride of codeia obtained from that base by the action of phosphoric 

 acid : in physical and chemical properties this product much resembles 

 the two bodies thus obtained from morphia and codeia products by the 

 action of water ; and hence these two bodies probably contain, like it, C 136 

 associated with I in the base. 



In order to show the resemblance between, or rather the identity of the 

 codeia and morphia products, the formulae given in Part III. have been 

 adopted in this paper (viz. those containing C 68 ); but the author has no 

 doubt that each of the substances has really double the formula ascribed 

 to it (t. e. that each contains C 130 ). 



The substances of composition C 136 H 161 1 N 8 O 20 , 8HI obtained, as above- 

 mentioned, from codua and morphia products by the continued action of 

 water gave the following numbers on analysis after drying at 100°: — 



