218 Intelligence and Miscellaneous Articles. 



It is a di-iodate composed of 



One equivalent of iodic acid 166 or 35 



Two equivalents of cinchonia 308 „ 65 



474 100 



Hydriodic Acid combines very readily with cinchonia. It cry- 

 stallizes in transparent and slender needles of a pearly lustre. It is 

 slightly soluble in cold water, more soluble in hot, and on cooling 

 it crystallizes. Its taste is at first but slight ; but it is developed in 

 a short time and is bitter and metallic. The hydriodate and iodate 

 of cinchonia may remain some time together without decomposing; 

 but eventually, and especially when the solutions are concentrated, 

 iodide is deposited ; when acid is present the decomposition occurs 

 rapidly. 



Iodine and Quina. — Iodine acts upon quina similarly to cinchonia ; 

 it is difficult to distinguish the iodides from each other on account 

 of their great resemblance as to appearance, colour, taste, and 

 fusibility. 



It is probably composed of 



One equivalent of iodine 126 or 27*75 



Two equivalents of quina 328 „ 72-25 



454- 100- 



Iodate of Quina. — This salt is less soluble than the iodate of cin. 

 chonia. M. Pelletier did not make a direct analysis of it, but con- 

 cludes from the constitution of the iodide that it is composed of 



One equivalent of iodic acid 166 or 33*6 



Two equivalents of quina 328 „ 66 4 



494 100- 



Hydriodate of Quina may be obtained either by direct action or 

 double decomposition. Its crystals are more slender but less trans- 

 parent and soluble than those of hydriodate of cinchonia ; they have 

 a tendency to the mammillated form. 



Iodine and Morphia. — Iodine acts in a much more complicated 

 manner upon this than the other alkalis. If morphia be triturated 

 with one fourth of its weight of dry iodine, the matter becomes of a 

 reddish brown colour, without yielding any smell of iodine ; but 

 after some hours have expired, its colour changes to a violet brown 

 and even to a black, and a smell of iodine is perceptible. It seems 

 as if the iodine separates after being sometime combined with the 

 morphia. 



Morphia, triturated with half its weight of iodine, exhibited simi- 

 lar phaenomena, but with greater rapidity. The product was inso- 

 luble in cold water but plentifully dissolved by it when boiling. The 

 solution was acid when half a part of iodine was employed, but neu- 

 tral with a smaller proportion y but much hydriodate of morphia 



