236 LUelligence and Miscellaneous Articles. 



a hydriodate and an iodate, from the latter of which the iodic acid 

 may be separated by the original method of M. Gay.Lussac, and 

 more perfectly by the recent method of M. SeruUas {Ann. de Chim. 

 et de Phys. xliii. pp. 127 and 217); secondly, the action of euchlo- 

 rine, as suggested by SirH. Davy; and, thirdly, the action of water 

 on the perchloride of iodine, and subsequent separation of iodic 

 acid by means of alcohol, as also proposed by M. Seruilas (see PhiL 

 Mag. and Annals, N.S , vol. ix. p. 149): to rliese Mr. Connell pro- 

 poses to add the agency of nitric acid, which he thinks will be found 

 to equal in facility of execution any of the preceding processes. 



The vessel employed was a rather large and tall flask, into which 

 fifty grains of iodine and an ounce of fuming nitric acid were put; 

 the acid was made to boil, and as soon as any iodine sublimed and 

 condensed on the sides of the vessel, it was washed back again into 

 the liquid by agitation. After the process had been continued 

 sometime, a precipitation of white crystalline grains was observed 

 to take place; and the operation of boiling and washing back the 

 sublimed iodine was continued until the free iodine had to a great 

 extent disappeared. The whole was then decanted into a shallow 

 basin and evaporated to dryness. Any free iodine which had re- 

 mained was soon dissipated by the heat. The residue of the eva- 

 poration consisted of whitish crystalline grains, which were iodic 

 acid, retaining a little nitric acid, from which they appeared to be 

 freed by one or two solutions in water, and re-evaporations, when 

 they lost most of their crystalline appearance, and became a whitish 

 deliquescent mass, occasionally with a light purplish tint, from a 

 tendency to decomposition by the heat of evaporation. Where no 

 particular precautions were taken to prevent loss in the, state of 

 vapour, and where the process was not continued until the entire 

 disappearance of iodine, the quantity of acid obtained approached 

 that of the iodine employed j a larger proportion of iodine might 

 probably be used, with the same quantity of acid. — Jamesons 

 Journal, June 1831, p. 72. 



. NEW SCIENTIFIC BOOKS. 

 Just published. 



The Twenty-second Number of Professor Leybourn's Mathema- 

 tical Repository is published. It contains solutions to twenty 

 questions in difterent parts of pure and mixed mathematics (and as 

 many new ones for future solution) by various contributors. 



The separate papers are: 1. Two indeterminate Problems, by 

 James Cunliffe, Esq. late of the Roy. Mil. Coll. 2. Analysis and 

 Construction of a Geometrical Problem, by C. F. Barnwell, Esq., 

 A.M. F.R.S. F.S.A. 3. A History of the Investigations respecting 

 the Properties of Rule Surfaces, or such as can be generated by 

 the motion of a right line subjected to certain conditions, by T. S. 

 Davies, Esq. F.R.S.E. F.R.A.S. 4. An Inquiry into the Author 

 of the Second and Third Properties of the Stereographic Projection 

 of the Sphere, completing the Inquiries of Delambrc on that Sub- 

 ject in his History of Astronomy, by the same Gentleman. .5. Hnrce 



Arithmeiicce, 



