Having thoroughly studied the process, we began our experiments. The three first producing no effect, we concluded that the water contained neither fixed air, iron, nor copper; but upon the mixture of the nitrous acid, mentioned for the fourth experiment, we perceived a light substance settle upon the surface, of a whitish colour, and extending but a little way, which led us to believe that the quantity of sulphur, or of sulphurous vapours, must be infinitely small. The fifth experiment proved that the water contained vitriolic salts, or at least vitriolic acid mixed with calcareous earth. We ascertained the existence of this acid, by pouring some drops of a solution of heavy earth into the water, which became white and nebulous, and the sediment that slowly settled at the bottom of the vessel appeared whitish and in very fine grains. We had no solution of silver for the sixth experiment, in order to ascertain whether the water contained marine salt. The seventh proved that it had no fixed alkali. By the eighth experiment, we found that the water contained a great quantity of calcareous earth, but no magnesia. Having poured some drops of acid of sugar, we observed the calcareous earth precipitate to the bottom of the vessel in clouds and a powder of a whitish colour; we mixed afterwards some solution of corrosive sublimate to find the magnesia; but the sediment, instead of becoming red, preserved the same colour as before; a proof that the water contained no magnesia. We made use of this water for tea and for our common drink. It was not till after three or four days that we found it contained some saline particles. M. Kasloff boiled also some of the water taken at the spring, till it became totally evaporated; the whitish and very salt earth or powder which remained at the bottom of the vessel, as well as the effect it produced on us, proved that this water contained nitrous salts. We remarked also that the stones taken out of this stream were covered with a calcareous substance tolerably thick, and of an undulated appearance, which, when mixed with the vitriolic and nitrous acid, produced symptoms of effervescence. We examined others taken from what appeared to be the fountain head of the waters, and where they have the greater degree of heat; we found them covered with a stratum of a kind of metal, if I may so call a hard and compact envelopement of the colour of refined copper, but the quality of which we could not ascertain; we found also some of this metal, which appeared like the heads of pins; but no acid could dissolve it. Upon breaking these stones, we discovered the inside to be very soft and mixed with gravel, with which I had observed these streams to abound. I ought to add here, that we discovered upon the border of the stream, and in a little moving swamp that was near it, a gum, or singular _fucus_[25], that was glutinous, but did not adhere to the ground.