54 Dr. J. Stenhouse on the [Jan. 8, 



six parts of ether ; then two parts of iodine are added, and the mixture 

 agitated until the whole of the iodine is dissolvad ; nine parts of very 

 finely powdered lead oxide (litharge) are now introduced in small portions 

 at a time with frequent agitation. A marked action takes place, ac- 

 companied by development of heat, and the colour of the solution rapidly 

 disappears. On distilling off the ether and extracting the residue with 

 hot benzol, the iodorcin separates in the crystalline state on cooling. 

 Two or three alternate crystallizations from benzol and from w r ater 

 suffice to render the compound pure ; but care must be taken not to boil 

 the aqueous solution for any length of time, as the iodorcin is thereby 

 partially decomposed. 



Monoiodorcin in a pure state crystallizes in colourless prisms, which 

 melt at 86-5, and decompose with evolution of violet vapours of iodine 

 when strongly heated. Concentrated sulphuric acid has but little action 

 on the substance in the cold ; but when gently heated with it, the iodorcin 

 is decomposed and iodine is freely liberated. "Warm nitric acid likewise 

 acts energetically, evolving nitrous fumes and liberating iodine. Iodorcin 

 is only slightly soluble in cold water, but readily in hot water. It is 

 very soluble in ether and in hot alcohol, moderately so in benzol and in 

 hot petroleum (crystallizing out from the latter almost entirely on cooling), 

 slightly soluble in carbonic disulphide. It is quite destitute of the pe- 

 culiar astringent sweet taste so characteristic of pure orcin. 



Dried in vacua and submitted to analysis, it gave the following 

 results : 



I. '332 gramme substance gave '311 gramme argentic iodide. 



II. *256 gramme substance gave '314 gramme carbonic anhydride and 

 067 gramme water. 



I. II. 



33-44 

 2-90 

 50-63 



250 100-00 



These numbers correspond with those required by the formula 

 C,H,I0 2 . 



Monoiodresorcin, C 6 H 5 1 O a . This compound is prepared in a similar 

 manner as the corresponding orcin compound : 10 parts of resorcin and 

 24 of iodine are dissolved in 60 of ether, and about 110 of lead oxide are 

 gradually added. After removal of the ether and extraction with benzol, 

 the iodorcin is purified by crystallization from hot water, in which it is 

 much more soluble than the iodorcin. lodresorcin crystallizes in rhoin- 

 boidal prisms, which are very difficult to obtain colourless ; they melt at 

 67, and, like those of the orcin derivative, decompose \vhen strongly 



