290 M, Chevreul's Chemicai Examination of two [April, 



We may conclude from these 

 experinaeuts that the precipitate 

 consisted of the phosphates of 

 lime, and magnesia, and of per- 

 oxide of iron, probably united 

 to phosphoric acid. 



b. Solution of No. 7, from which 

 the Precipitate (7) had been 

 separated. 



12. Oxalic acid separated 

 0-362 gr. of lime = 0-872 gr. 

 sulphate of lime, which, when 

 dissolved in muriatic acid, gave 

 no cloudiness with ammonia, 

 but the solution assumed a vio- 

 let rose colour. 



13. The liquid which had 

 been precipitated by oxalic 

 acid was mixed with carbonate 

 of potash, and evaporated to 

 dryness ; the residuum, treated 

 with water, gave carbonate of 

 magnesia, = 0-130 gr. of dry 

 magnesia ; it contained a trace 

 of sihca. 



14. The solution from which 

 the magnesia had been separat- 

 ed contained 0-014 gr. of sul- 

 phuric acid, which was sepa- 

 rated by nitrate of barytes ; it 

 contained no phosphoiic acid. 



15. It is very probable that 

 in the specimen A, calcined, 



1st. The 0-014 gr. of sul- 

 phuric acid were united to 0-01 

 of lime. 



2d. That the 0-362 gr. of 

 lime precipitated by oxalic 

 acid, minus 0-01 gr. and the 

 0-130 gr. of magnesia were in 

 the state of carbonates. 



According to the preceding 

 experiments, the specimen A 

 contained. 



We may conclude from these 

 experiments that the precipi- 

 tate (7) was formed of the 

 phosphates of lime and magne- 

 sia, and of the oxides of iron 

 and manganese, probably unit 

 ed to phosphoric acid. 



b. Solution ofNo.ljfroimvhich 

 the Precipitate (7) had been 

 separated. 



12. Oxalic acid threw down 

 0-270 gr. of lime ; the lime 

 combined with sulphuric acid, 

 and then dissolved in nitric 

 acid, gave no rose colour with 

 ammonia. 



13. The liquid which had 

 been precipitated by oxalic 

 acid gave 0-06 gr. of magnesia, 

 and 0-02 gr. of silica. 



14. The liquid from which 

 the magnesia and silica had 

 been separated contained 0-016 

 gr. of sulphuric acid, without 

 any phosphoric acid. 



15. It is very probable that 

 in the specimen B, calcined, 



1st. The 0-016 gr. of sulphu- 

 ric acid was combined with 

 0-011 gr. of lime. 



2d. That the 0-27 gr. of hme, 

 minus 0-01 1 gr. and the 0-60 of 

 magnesia, were in the state of 

 carbonates. 



According to the preceding 

 experiments, the specimen B 

 contained, 



