74 New Scientific Books. [Jan. 



This colour, like those supplied by the mineral kingdom, was unalterable bj 

 exposure to the air; by varying the proportions of sub-acetate of lead, a«d 

 chromate of potash, tint's varying from pale to deep yellow may be obtained. 



The same process is applicable to woollen, cotton, and linen ; but it is better 

 to digest these different cloths in a solution of acetate of lead, heated to about 

 ISQo of Fahrenheit. 



From the inconvenience which this colour possesses as well as the former, of 

 being partially decomposed by soap, I am of opinion that it can be employed 

 only fur dyeing silk.— (Ann. de Chim. vol. xv. p. 77.) 



V. Process Jar procuring pure Zirconla. 



Powder the zircons very fine, mix them with two parts of pure potash,, 

 and heat them red hot in a silver crucible for an hour. Treat the substance 

 obtained with distilled water, pour it on a filter, and wash the insoluble part 

 well ; it will be a compound of zirconia, silex, potash, and oxide of iron. Dis- 

 solve it in muriatic acid, and evaporate to dryness, to separate the silex. Re- 

 dissolve the muriates of zirconia and iron in water; and to separate the zirco- 

 nia which adheres to the silex, wash it with weak muriatic acid, and add it to 

 the folution. Filter the fluid, and precipitate the zirconia and iron by pure 

 ammonia ; wash the precipitates well, and rhen treat the hydrates with oxalic 

 acid, boiling them well together, that the acid njay act on the iron, retaining it ia 

 solution whilst an insoluble oxalate of zirconia is formed. It is then to be 

 filtered, and the oxalate washed, until no iron can be detected in the water that 

 passes. The earthy oxalate is, when dry, of an opaline colour ; after being well 

 washed, it is to be decomposed by heat in a platinum crucible. 



Thus obtained, the zirconia is perfectly pure, but is not affected by acids. It 

 must be re-acted on by potash as before, and then washed until the alkali is- 

 removed Afterwards dissolve it in muriatic acid, and precipitate by ammonia. 

 The hydrate thrown down, when well washed, is perfectly pure, and easily 

 soluble in acids. — (MM. Dubois and Silveira, Ann. de Chim. vol. xiv, p. 110.) 



Article XVI. 

 NEW SCIENTIFIC BOOKS 



PREPARING FOR PUBLlCAlIOIf . 



Shortly will be published A Series of Questions and Answers in the Practic® 

 ofPhysic, Materia Medica, &c. written for the Use of Gentlemen preparing for 

 theirKxaminatiou at Apothecaries* Hall. By C. M. Syder, Surgeon. 



Mr Arrowsmith has nearly ready for publication, A Map of the Constella- 

 tions, in two large sheets, accompanied by a men)oir. 



Shortly will be published, 1 he Principles of Foreign Medicine, explained, 

 illustrated, and applied to British Practice. By J. G. Smith. MD. 



Dr. Hamsboitom has nearly ready, Practical Observations on Midwifery^ 

 with a Selection of Cases. 



Dr. Ay re is printing a new edition, with additions, of his Practical Observa- 

 tions on Disorders of the Liver. 



JUST PimU^RED. 



A System of Chemistry, in Four Volumes, 8vo. By Thomas Thomson, MD. 

 Regius Professor of Chemistry in the University of Glasgow, &c. &c. Sixth 

 Edition, revised and corrected throughout. Price 3/. boards. 



A Dissertation on the Treatment of Morbid Local Affections of the Nerves. 

 By Joseph Swan. 8vo. 10«. 6d. 



An Essay on the Diagnosis between Erysipelas, Phlegmon, and Erythema, 

 By George Hume Weatberhead, MD. 8vo. At. 



