CHEMISTRY. 211 



duced into a flask, and to it there is added a mixture of 1 molecule 

 of the chloride, and 2 molecules of acid. The mixture is kept 

 cooled, and, after 12 hours, water is added, and the liquid sub- 

 jected to distillation. The distillate is saturated with carbonate 

 of potassium. The product which separates is the ether formed 

 b}' the acid used, and the corresponding alcohol. This ether is 

 then saponified by potash. The author has prepared in this way 

 propylic and butylic alcohol. Bull. Soc. Chim., July, 1870. 



Phosphorescence. C. E. Avery. If a bit of luminous phos- 

 phorus a match-tip for instance be blown upon, its light 

 ceases until a second or so after the current has stopped ; it makes 

 no difference whether the current of air comes from the mouth or 

 from the bellows. The explanation seems to be that the light 

 comes not from the solid phosphorus, but from a vapor clinging to 

 it, yet easily blown away. 



Reduction of Isatine to Indigo-Blue. Bayer and Emmerling 

 state that when pulverized isatine is mixed with 50 times its 

 weight of a mixture of equal parts of terehloride of phosphorus 

 and chloride of acetyl, to which some phosphorus has been 

 added, and the mixture is heated for several hours in a sealed 

 tube at from 75 to 80 C., there separates from fluid, when largely 

 diluted with water, a dark blue substance. This substance, 

 when washed and treated with alcohol, yields a body, in all its 

 properties, identical with indigo-blue, the amount varying from 

 10 to 20 per cent, of the isatine employed. Ber. deutscli. chem. 

 Ges. 



Synthesis of Indigo-Blue. Emmerling and Engler state that 

 when S}~rupy nitro-acetophenoneis heated in small portions until it 

 forms a hard mass, then dissolved in chloroform, and treated with 

 a mixture of 10 parts zinc-dust and one part soda-lime, there 

 remains, after evaporation of the chloroform, a substance, which, 

 heated quickly in an ignition tube, gives a sublimate containing a 

 small quantity of indigo-blue. The amount obtained is very 

 small compared with the materials employed, and the process 

 is interesting only from a chemical point of view. Zeitscli. fur 

 Chcmie. 



