1867.] Chemistry. 531 



thus obtained is to be converted into peroxide of barium to furnish 

 peroxide of hydrogen for bleaching purposes. 



A new kind of artificial stone invented by M. Sorel deserves a 

 passing notice. A strong solution of chloride of magnesium will 

 consolidate a large amount of calcined magnesia, forming an inso- 

 luble oxychloride of magnesium, resembling the oxychloride of zinc 

 proposed by the same inventor for stopping teeth. . When, however, 

 a weaker solution of the chloride of magnesium is used with some 

 calcined magnesia, the mixture has the power of holding together 

 fifteen or twenty times its weight of sand and other materials which 

 set into a substance sufficiently hard to be used for flags and tiles, 

 and which may be coloured by ordinary mineral colours for orna- 

 mental purposes. 



The space we have in this number only allows the mention of 

 the publication of useful practical papers " On the Analysis of 

 Cast Iron," by Dr. G. E. Tosh;* and also "On the Practical 

 Losses of Sulphur in the Manufacture of Oil of Vitriol," by 

 Mr. C. E. A. Wright.t 



Proceedings of the Chemical Society. 



On the 6th of June, Sir B. C. Brodie delivered a lecture to an 

 unusually large audience, " On the Mode of Kepresentation afforded 

 by the Chemical Calculus, as contrasted with the Atomic Theory." 

 For this lecture and the interesting discussion which followed it we 

 must refer our readers to an admirable report in the ' Chemical 

 News ' for June 14. And those who wish to see the opinions of 

 some other chemists, mathematicians, and physicists on Sir B. C. 

 Brodie's system may consult the papers of Professor Williamson 

 and Mr. Stanley Jevons in the ' Laboratory ; ' and the articles of 

 Professor Wanklyn and Dr. Gram Brown, in the ' Philosophical 

 Magazine ' for August and September. 



The last meeting of the Society was held on June 20, when 

 Mr. W. H. Perkin read a paper " On some new Derivatives of the 

 Hydride of Salicyl ; " Dr.. Gladstone read a second paper " On 

 Pyrophosphoric Acid ;" Dr. Phipson gave an " Analysis of a Biliary 

 Concretion found in a Pig, and a new Method of preparing Biliver- 

 din;" Dr. Stenhouse made a communication on the action of 

 Chloride of Iodine on Picric Acid; and Mr. Henry Bassett read a 

 short paper "On Julin's Chloride of Carbon." A paper by MM. 

 J. A. Wanklyn, E. T. Chapman, and M. H. Smith, " On Water- 

 analysis : Determination of Nitrogenous Organic Matter," was also 

 read. As the subject of this paper is of great public interest we give 



* ' Chemical News,' Aug. 9 and 23, 1867. f Ibid., Aug. 23 and 30. 



