lxxxii GENERAL SUMMARY OF SCIENTIFIC AND 



pure iron wire, both are dissolved and made tip to the same 

 volume, and one fiftieth of each is taken for titrition. 



J. L. Smith lias discovered, in investigating the anomalous 

 fact that while ferric oxide as ordinarily precipitated and 

 dried is not magnetic, the oxide thrown down from solutions 

 of meteorites is invariably magnetic; that any solution of 

 iron containing nickel, cobalt, or copper gives a precipitate of 

 ferric oxide which becomes magnetic on drying. The exact 

 cause of this action is obscure. Chandler suggests the for- 

 mation of a saline oxide, analogous to the magnetic oxide of 

 iron, with these metals. 



Boussingault has published an elaborate research into the 

 manufacture of steel by cementation, the analytical results 

 of which must prove of great value. 



Bauer has examined the action of strong sulphuric acid 

 upon lead and lead alloys. He finds that small quantities of 

 antimony and copper increase the resisting power of lead to 

 this acid, but the bismuth in a lead alloy diminishes it. 



Kaemmerer has succeeded in obtaining w r ell-defined crys- 

 tals of cadmium by distilling the metal in a current of hy- 

 drogen. The crystals are isometric, being octohedrons, do- 

 decahedrons, and their derivatives. 



Delachanal and Mermet have prepared a compound of 

 platinum, tin, and oxygen analogous to the gold compound 

 known as the purple of Cassius. When the brown liquid 

 which is obtained when a solution of platinic chloride is 

 mixed with one of stannous chloride is diluted with water 

 and boiled, a brown substance is precipitated which, when 

 well washed with hot water, contains no chlorine, but only 

 oxygen, tin, and platinum. The authors have also prepared 

 the same substance by placing a strip of tin in platinic chlo- 

 ride. Its composition somewhat varies with its mode of 

 j}reparation. 



Bibra concludes from his investigations that silver chlo- 

 ride when blackened by the action of light is not subchloride ; 

 the true subchloride, obtained by the action of hydrochloric 

 acid on argentous citrate, having the formula Ag 4 Cl 3 . 



ORGANIC CHEMISTRY. 



In Organic Chemistry, Carnelley has shown that when the 

 mixed vapors of carbon disulphide and alcohol are passed 



