12 



Dr. C. R. A. Wright's Contributions to the [Nov. 16, 



product is got on filtration through asbestos and precipitation by water 

 containing apparently 2H 2 less than the preceding compound. Dried 

 at 100°, 



0-302 grm. gave 0-475 C0 2 and 0'135 H 2 0. 

 0*248 grm. gave 0*1845 Agl. 



Calculated. 



^68 



ln 



H 82 I 2 N 4 O 10 ,4HI 



816 



— » S 



43-40 



86 



4-58 



762 



40-53 



56 



2-98 



160 



851 



1880 



100-00 



Found. 



42-89 

 4-97 

 40-20 



Hence this substance is formed from the preceding one by the reaction 



H 86 I 2 N 4 12 ,4HI=2H 2 0+C e 



H 82 I 2 N 4 O 10 , 



4HI. 



If codeia, hydriodic acid (3 to 5 parts), and phosphorus be heated to rapid 

 ebullition, so that most of the aqueous portion distils off along with the 

 CH 3 1 formed, the boiling-point gradually rises to 130°, or a little above, at 

 which temperature the colourless liquid begins again to become slightly 

 brown : on precipitation of the filtered product with water &c, as before, 

 the following numbers were obtained after drying at 100°: — 



Specimen A. 0*3575 grm. gave 0*589 C0 2 and 0* 168 H 2 O. 



0-402 „ 0*307 Agl. 

 Specimen B. 0*358 „ 0*583 C0 2 and 0*164 H 2 O. 



0*369 „ 0*2815 Agl. 

 Specimen C. 0*3855 „ 0*635 C0 2 and 0*178 H 2 0. 



0*363 „ 0*276 Agl. 



Found. 



Calculated. 



C 68 



N 4 



816 

 86 



762 

 56 

 96 



44*93 

 4*73 



41*96 

 3*09 

 5-29 



CLEL 



I 2 N 4 6 ,4HI 



1816 100-00 



A. 

 44-92 

 5-22 

 41*27 



44-41 

 5-09 

 41*23 



C. 

 44-91 



5-13 

 41-09 



Mean. 

 44-75 

 5-15 

 41-20 



Hence this substance is formed from the preceding one by the reaction 

 C 68 H 82 1 2 N 4 O 10 , 4HI+8HI=I 8 + 4H 2 + C 68 H 82 1 2 N 4 6 , 4HI. 



§ 2. Action of Water on the foregoing Compounds. 

 "When either of the two first compounds just described is dissolved in a 

 large bulk of hot water, and the solution allowed to cool, solid white flakes 



