S18 Intelligence and Miscellaneous Articles. 



rendered acid by muriatic acid, and containing soda as well as phos- 

 phoric acid, was digested for a considerable time with a mixture of 

 chloride of calcium and ammonia in excess, for the purpose of pre- 

 cipitating the phosphoric acid. The precipitate was heated to red- 

 ness, dissolved in hydrochloric acid, and decomposed by sulphuric 

 acid and alcohol. The phosphoric acid in an average of fourteen ex- 

 periments amounted to 45'71 per cent., consequently the compound 

 consisted of 3CaO, Pa O^. If, however, a pure solution of 2NaO, 

 PqOj be precipitated by a mixture of chloride of calcium and ammo- 

 nia, we obtain 2CaO, Po O^. According to Berzelius, the same pre- 

 cipitate is formed by adding the salt of soda to the soluti6n of chlo- 

 ride of calcium by drops. If, however, the method of proceeding be 

 reversed, and the addition of the precipitant be continued as long as 

 the liquid has an alkaline reaction, or the lime salt be added to a so- 

 lution of phosphate of ammonia containing free ammonia, 8CaO, 

 3P2 O5 is formed. 2CaO, Pg O5 is crystalline, both the basic salts 

 are gelatinous, and 5CaO, Po O3 is mucous, resembling in this respect 

 precipitated fluoride of calcium. — Poggend. Annal., vol. Ixiv. p. 251— 

 271, and 405-425. .aaii 



ANALYSIS OF TAURINE. 



Professor Redtenbacher of Vienna, formerly a pupil of Liebig, 



has subjected taurine (the asparagine biliaire of Gmelin) to a new 



analysis, and has found it to contain 26 per cent, of sulphur; this 



substance, on account of the regularity of its crystalline form, is 



one of the most beautiful presented by organic chemistry. The 



chemists who have analysed taurine, overlooked the presence of 



sulphur, and gave as its formula, C''H'NO'°. — Journ. de Pharm. et de 



Ch., Juin 1845. ••• ■ • •■ 



\t.f'. nifit ; M,h \[^Ra tiita 



DOUBLE SALT OF [bi] CHLORIDE OF MERCURY AND ACETATE Ol( 



COPPER. 



M. Wohler formed this double salt by mixing cold saturated so- 

 lutions of its component salts. 



The compound is gradually deposited in concentric hemispheric 

 crystals of a deep blue colour and great beauty. It is nearly inso- 

 luble in cold water ; in boiling water it is converted into a bright 

 green powder, and bichloride of mercury remains in solution. 



According to repeated analyses performed by M. Hiitteroth, and 

 which agreed satisfactorily, the blue compound is formed of two 

 equivalents of chloride and one equivalent of anhydrous basic acetate 

 of copper, or in 100 parts, of — 



[Bi] chloride of mercury .... 67*65 

 Acetate of copper 32"35 



loo^ 



J own. de Pharm. et de Ch., Juin 1845. 



