16 



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



this compound a voluminous white precipitate is produced, which is ap- 

 parently a mixture of three bases, two of which contain iodine, whilst the 

 third is free from that ingredient. The first one, which forms only a 

 small fraction of the whole, is the free base of the original compound, 

 C 68 H 86 1 2 N 4 12 ; this is readily soluble in ether, and may be obtained 

 as hydriodate (as previously stated) by digesting the precipitate with ether, 

 and agitation of the extract with hydriodic acid, whereby the original sub- 

 stance is reproduced. To prevent frothing, the precipitate must be well 

 drained from the aqueous portion. By continuing the extraction until 

 some 6 litres of ether have been employed for exhausting the precipitate 

 from 40 grms. of original substance, the whole of this base is removed, or 

 nearly so. Attempts to prepare the base itself by evaporation of the ether 

 yielded only a tarry substance which could not be removed from the vessel 

 employed ; treatment with water or alcohol more or less decomposes it. 



By employing a large bulk of ether after this first base has been almost 

 wholly removed, an extract is obtained from which on evaporation solid 

 flakes separate ; these are much less soluble in ether than the first base, 

 and after drying at 100° gave the following numbers, indicating the formula 



C 68 H 81 IN 4 O 10 :- 



0-1985 grm. gave 0*4705 C0 2 and 0*119 H 2 O. 

 0-1210 grm. gave 0*0260 Agl. 



Calculated. Found. 



C 68 816 65-81 64-65 



H 81 81 6-53 6-66 



1 127 10-24 11-61 



N 4 56 4-52 



O 10 160 12-90 



C 68 H 81 IN 4 O 10 1240 100 00 



Apparently these flakes still retained a trace of the first base; the 

 mother liquor from which they separated, when evaporated to dryness, left 

 a small amount of residue containing 14*18 per cent, of iodine. Treated 

 with hydriodic acid, these flakes gave a hydriodate yielding these numbers 

 after drying at 100°:— 



0-3675 grm. gave 0*6335 C0 2 and 0*181 H 2 O. 



0-3/1 grm. gave 0*2405 Ag I. 





Calculated. 



Found. 





816 



46*58 



47*00 



H 8! 



85 



4*85 



5-47 



I s 



635 



36-24 



35-02 



N 4 



56 



3-20 





o,„ 



160 



9*13 





C c8 H 81 IN 4 O 10 ,4HI 



1752 



100*00 





