548 M'XEVEN ON THE MINERAL WATER 



in cold distilled water, with the exception of a minute brown sediment 

 which dried in the water bath, weighed 0.05 of a grain. It seemed to 

 be muriate of lime, for it was not affected by muriatic acid, but touched 

 with concentrated sulphuric acid, it effervesced, and there remained a 

 white smooth residue which was manifestly sulphate of lime formed in 

 the experiment. 



To the aqueous solution of the acetate, there was added ammonia 

 in excess, which occasioned a precipitate of magnesia : washed and 

 dried it weighed 0.10 gr. Now, as in 100 parts of acetate of magnesia 

 there are 34.04 of base,* we have this proportion ; as 34.04 : 100 :: .10 : 

 .29, which substracted from 6.35 gives .29 acetate of magnesia, and 6.06 

 acetate of lime. Again, to find the base appertaining to this acetate 

 6.06 ; say as 100 is to 34.25, the proportion of base in 100 parts acetate 

 of lime, so is the sum 6.06 to its base 2.08.f But it is necessary to re- 

 convert these acetates into carbonates, in which state they existed in 

 the mineral water, and as in carbonate of magnesia the base is twenty- 

 five per cent, we have .25 : 100 :: .10 : .40.J And as the base in car- 

 bonate of lime may be stated at fifty-eight per cent, we have 53 : 100 :: 

 2.08 : 3.586 ; or say 3.59. Thus we find the two carbonates, that of 

 magnesia = .40, and that of lime 3.59, both = 3.99 grains. 



Examination of the Solution by Muriatic Acid. 



9. Dilute muriatic acid, digested on the residuum left in the last ex- 

 periment, dissolved a portion, and a dark muddy sediment remained of 

 a gritty feel. When collected and ignited on the filter it afforded 0.80 

 of silex. 



'■ Thompson, vol. 3, p 63. 4th ed. f Thompson, ibid, p. 64. J Thompson, vol. 2. p. 650. 



