In the bathing apartment there are four large reservoirs, or basins, constructed with stone and lime; they are equal in size, communicate the one with the other, and are named Tigre, Sepultura, Desague, and Vejeto: in these reservoirs, however, the temperature of the water is not equal: the first indicates on the thermometer of Fahrenheit 90°, the second 89°, the third 88°, and the fourth 87°; the air of the habitation being 70°. In the place where this water was first discovered, it at present indicates as many as 90°: Haenk, in the year in which he instituted his analysis, observed that it was only 86°, which proves that the temperature has since then increased. The gas which arises from this water, when collected, extinguishes flame; produces in lime-water a precipitate which dissolves in acetic acid with effervescence; and it precipitates the acetate of lead, of a dirty yellow colour. The water reddens blue paper; but, on drying, it recovers its original colour, a circumstance which proves that there is a free acid: turmeric paper it does not change the colour of, unless its volume has been decreased by evaporation. A few drops of any acid produce effervescence. The nitrate of silver gives a violet-colour precipitate, the acetate of lead a dirty yellow, the muriate of barytes a white, but it is necessary to add to it a few drops of acid; the prussiate of potash produces a blue precipitate, using the precaution to reduce the water, and of adding to it some drops of nitric or muriatic acid. Liquid ammonia renders it turbid, which shows that it contains magnesia; corrosive sublimate produces a half obscure precipitate, which afterwards effervesces with an acid; it instantly coagulates milk, renders wine and the water of peaches or pears turbid, giving rise to effervescence with the three last. A piece of clean silver, if placed in it for some minutes, becomes somewhat black; when agitated, it disengages carbonic acid with precipitation, and all the water is filled with bubbles; when boiled, it loses its smell, it disengages all the free acid, and it no longer reddens blue paper. Four bottles of this water, when evaporated, have given forty-three grains of salts: during the evaporation the surface became coated with a white film, and a light white substance was precipitated, which consisted of the carbonate of magnesia and lime, abandoned by the carbonic acid which had held them in a state of solution. One hundred grains, obtained by evaporation, yielded Insoluble matter composed of silica and sulphate of lime 10 grains. Carbonate of magnesia 28 Muriate of soda 14 Carbonate of lime 7 Sulphate of iron,—indications of Bicarbonate of soda 39-98 The sulphuretted hydrogen gas, and the carbonic acid disengaged, could not be ascertained, for want of proper apparatus.