130 Notice of some Recent [Feb. 



carbonate of lime from the portion dissolved in water. The 



salt consists of 



Oxalate of lime 0-904 



Chloride of Calcium - - - - 0*778 

 Water 0-881 



2-563 

 Double salt of chloride of calcium and acetate of lime. (Pog. 

 Ann. xxviii. 21 .) The combination of chloride of calcium 

 with acetate of lime is easily obtained by dissolving small 

 portions of both in water, and allowing the solution to eva- 

 porate. The double salt separates in large crystals. It is 

 very soluble in water. Analyzed by oxalate of ammonia 

 and nitrate of silver the constituents were 



Acetate of lime - - - - 0*711 

 Chloride of calcium- - - 0*500 

 Water 0*789 



2*563 

 Sulphated Protoxide of Iron, and Chloride of Iron. — Bons- 

 dorff has shewn, (Poggendorff, xxxi.) 1. That sulphate of 

 iron may be obtained completely free from peroxide, by 

 rendering, before crystallization, the solution acid, which 

 has been made neutral by boiling. 



2. That this salt, moderately dry or moist, is not altered 

 by exposure to the air ; but in dry air, or in a temperature 

 of 104° F, in the course of time it gradually decomposes. 



3. There are three varieties of vitriol, the first greenish 

 blue, formed from an acid solution free from peroxide ; the 

 second dirty green, from a neutral solution without per- 

 oxide ; and the last emerald green, from a solution impreg- 

 nated with peroxide salt. 



4. Chloride of iron may be obtained pure by rendering 

 the neutral solution slightly acid by means of muriatic acid, 

 and drying the crystals in a temperature between 86° and 

 104° F, mixed in a close vessel with a little chloride. At a 

 temperature of 122°, and in dry air, the chloride falls to a 

 white powder. 



5. The primitive form of the chloride of iron is an oblique 

 rhombic prism, and its atomic composition 1 atom chloride 

 of iron and 4 atoms water. 



Solubility of Bitartrate of Potash. — Brandes and Warden- 



