MINERAL SPRING AT R1ETF()NTEIN. 581 



temperature 20.7° C, so that 100.000 c.c. of water of 4° C. 

 contain 0.038013 of a gram of NO... The amount of nitrate 

 increases very considerably on standing. From water which 

 had been standing for several months values were obtained 

 several times larger than the initial values. Corresjjonding to 

 the increase in nitrate, a substantial decrease in the ainount of 

 ammonia -was recorded. 



Pliosplioric Acid. — The water contains traces of phosphoric 

 acid, obviously from the bones referred to above. A determi- 

 nation of the amount was not made. 



Iodine. — The solid residue of three and a half litres was 

 dissolved in the smallest possible quantity of water and poured 

 into alcohol, in order to remove part of the sodium chloride. 

 .After distilling oft" the alcohol, the residue was dissolved in 

 water, and a little chloroform, as well as a few drops of 

 " nitrose," added. The layei of chloroform showed a just per- 

 ceptible violet tinge. 



Determinations of the Rations. 



C aid II in. — The calcium was determined volumetrically by 

 precipitating with an excess of oxalic acid, dissolving the calcium 

 oxalate in acid, and titrating; and also by determining the excess 

 of oxalic acid in the liquid filtered oft' from the precipitate of 

 calcium oxalate. 



1. On titrating tiie excess of oxalic acid in the filtrate, 

 300 c.c. of water were found to contain 0.0274416 of a gram of 

 calcium. 100.000 c.c. of water of 4° therefore contain 9.1686 

 grams of calcium. 



2. Titration of oxalic acid in the dissolved calcium oxalate 

 showed that 300 c.c. of water of 22.5° contain 0.027923 of a 

 gram of calcium; hence 100,000 c.c. of 4° contain 9.3292 grams 

 of calcium. 



3. By adding oxalic acid and titrating the excess in the fil- 

 trate, the calcium in 100 c.c. of water was found to be completely 



N 

 precipitated by 4.70 c.c. of — oxalic acid. Therefore 100,000 c.c. 



10 

 of water of 4° contain 9.5 183 grams of calcium. 



4. Gravimetric determination : 3 litres of water of 24.3° gave 

 0.3915 of a gram ol calcuim ; hence 100,000 c.c. of water of 4° 

 contain 9.3533 grams of calcium. 



Mean value for the calcium in 100,000 c.c. of water of 4° 

 was therefore 9.34235 grams. 



Barinm. — Two determinations were made, each in three 

 litres of water, with the f oUowing results : — 



1. 100,000 c.c. of water 24.3'' contain 0.1270 grams BaSO^. 



2. 100,000 c.c. of water 21° contain 0.1236 grams RaS04. 



Therefore the mean amount of barium in 100,000 c.c. of 

 water 4° is 0.07374 of a gram. 



Maguesinm. — After precipitation of calcium as oxalate, the 



