90 University Geological Survey of Kansas. 
water is concentrated, and precipitated with calcium chlorid, and 
after filtration the ignited precipitate is treated with acetic acid 
to dissolve the carbonates. The residue which contains the 
fluorids is dried, and mixed with pulverized quartz and concen- .- 
trated sulfuric acid, and heated. The loss in weight is the hy- 
drofluric acid which has been volatilized. 
In order to determine Sulfur,” which may be present as sul- 
fids, hyposulfites, or free hydrogen sulfid, the water must be 
treated at the springs for each of the ions supposed to be pres- 
ent. The sulfur existing as free hydrogen sulfid gas and as sul- 
fids may be determined by treating a known volume of the 
water at the spring with an acid solution of cadmium clorid, 
and, after filtration, determining the cadmium by the usual 
methods. | 
For the quantitative determination of Chlorin, Bromin, and 
fodin,” the mixture of the evaporated salts is placed in a flask 
of 250 cc. capacity with 40 grams of potassium dichromate and 
enough water to make 100 cc., counting the water in which the 
halogens were dissolved. The flask is provided with a drop- 
ping funnel through which water may be added to keep the 
volume of the solution above two-thirds and not more than the 
original amount. ‘The flask is also connected to a vertical con- 
denser, which condenses the steam and halogen vapors. The 
halogen vapors are received at the lower end of the condenser 
in a five-per-cent. solution of potassium iodid. After the mixture 
has been boiled till the iodin is all distilled, eight cc. of sulfuric 
acid (equal volumes of sulfuric acid and water) is added — 
through the dropping funnel, and the mixture is again distilled 
until bromin no longer comes over. The iodin distilled over 
and the iodin set free by the bromin which was distilled over 
are each titrated with ;+, thiosulfate solution, and the iodin 
and bromin calculated from the amount used. The chlorin can 
be estimated with a silver nitrate solution in the cooled residue 
in the flask. 
For Nitrates, the methods described in the report of the Mas- 
sachusetts Board of Health for 1890 may be employed. 
36. Erdmann’s Journal, vol. LXX, or Cairns’s Quant. Anal., pp. 302-304. 
37. Journal of the British Chemical Society, vol. 49, p. 682, M. Dechan. 
