244 = Todine in the Mineral Waters of Saratoga. 
or soda, forming the iodate or hydriodate of the alkali, witli: 
which they are united. As the presence of potassa, in any 
of its combinations, in these waters, has not been indicated 
by any of the appropriate tests used for the purpose, it fol- 
lows that soda is the alkaline base, which retains the acid in 
question, forming the iodate or hydriodate of soda. To as- 
certain which of these acids forms the salt in question, I pour- 
ed over a quantity of the dry soluble salts of the water, an 
ounce of very pure alcohol, which, after standing a short 
time, was filtered off; this was found to contain the whole 
of the matter, which indicated the presence of iodine, and as 
todate of soda is not soluble in alcohol, I infer that the sub- 
stance taken up by the alcohol is the hydriodate of soda. 
ith a view to illustrate the position still further, and to 
arrive at the proportion of this salt, contained in a given 
quantity of the water, I evaporated one gallon of water in 
a porcelain basin placed in a sand bath, which was kept at 
the temperature of about 150°, and the evaporation was con- 
tinued until crystals of muriate of soda began to form on the 
' sides of the basin; it was now removed from the bath, and 
when cold the whole contents of the basin were thrown on 
a filter and the residuum, being well washed with recently 
distilled water, was removed and the filtered liquor again 
placed on the sand bath in a small basin, and suffered to 
evaporate to dryness, in a temperature of 150° 
A 
duum weighed, while warm, a trifle over three grains. It 
consisted principally of the hydriodate of soda, with a very 
minute quantity of common salt, which the small quantity 
of water in the alcohol used, and, possibly, the imperfectly 
dry state of the salts, before the alcohol was added, contrib- 
uted to render soluble in that menstruum. 
I now dissolved the salts thus obtained in a small quantity, 
of starch and water and having placed the solution in a Flor- 
ence flask, over a spirit lamp, added to it a few drops of 
sulphuric acid; as it bec rm, the blue color of the 
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