Those who know most of the Blue Sulphur, say that it combines the valuable properties of the White and Red Sulphur. This is probably true to some extent. The Blue Sulphur operates upon the liver with great energy, and at the same time acts as a tonic. These are, respectively, qualities of the White and Red Sulphur. The White Sulphur, although it scarcely ever fails to rectify derangements of the liver, depletes, and generally to some extent, produces debility. The latter effect, we believe, is never produced by the Blue Sulphur, owing probably to its tonic properties. We do not know, however, how far either has claim to preference. As to the similarity between this Spring and the Red Sulphur, we suppose it ascertained that wherever there is a derangement of the sanguiferous system, except where the lungs are affected, the action of the Blue Sulphur is equally, if not more salutary, than that of the Red. This water is, however, very exciting; perhaps even more so than the White Sulphur, and should consequently, like that Spring, be avoided by pulmonary invalids. There is also an approximation in the action of the Blue and Salt Sulphur waters. Both of these Springs are efficacious in affections of the stomach. Where the invalid retains a considerable degree of vigor, or where the system is irritable, the Salt Sulphur would be decidedly preferable, as that water occasions very little of the unpleasant, and in such cases, perhaps injurious excitement caused by the Blue Sulphur water. Where dyspepsy has advanced so far as to occasion extreme debility, probably the Blue Sulphur should be resorted to, at least for a while, as that water would sustain and strengthen the system, at the same time that it removed the disease. These remarks are the result of the observation of the practical effects of these waters, and of the experience of others, without pretension to professional skill. We believe, however, that they will be found strictly correct.