Dibrell and Watkins,) to the attention of travellers for health or pleasure. Dagger's Springs are situated within easy distances from some of the most interesting towns in the Valley of Virginia--they are forty-five miles from the White Sulphur; twenty-two from Lexington; eighteen from Fincastle, and sixteen from Pattonsburg. The following letter from a distinguished physician, affords all necessary information as to the medicinal properties of the waters, and the management of the establishment: _Danville, April 28, 1835_. I visited Dagger's Spring on the 24th of last July, and on the next day proceeded to subject the water to a number of chemical tests. The experiments performed, though not as full and as satisfactory as I could have wished, were sufficient to demonstrate that the water possesses highly valuable properties, and sufficient also to make us somewhat acquainted with the _nature_ of those properties. The most active mineral ingredients in the water are carbonated alkalies. In this it differs materially from the White and Salt Sulphur, and is more nearly assimilated in its qualities to the Red and Gray Sulphur. It is however more decidedly alkaline than either of those Springs. This peculiarity will ever recommend it to persons subject to acidities of the stomach, and to the other concomitants of dyspepsia; while the large quantity of hydrogen that it contains, will render it useful in all of those complaints for which sulphur water is usually prescribed. The following experiment was performed with the view of ascertaining the quantity of gas contained in the water. Three measures of the water were placed in a retort, and the bulb of the retort plunged in water, heated to the temperature of 108 Fahrenheit. The gas, as it was extricated, was received over mercury, in a graduated measure. The result was, that the three measures of water yielded one measure of gas. This gas was subsequently tested, and found to consist of sulphuretted hydrogen, azote, and atmospheric air--principally of the former. The presence of iron is not detected by the usual tests; but the water, when treated with prussiate of potash, and subsequently with sulphuric acid, yields a blue precipitate, which is evidently prussiate of iron--the sulphuric acid having a stronger affinity for potash than the prussic acid, disengages the latter. The acid thus disengaged, unites with the iron in the water, and forms the prussiate of iron or prussian blue. Although the water contains but about 36 grs. of mineral substances to the gallon,[1] it acts, under certain circumstances, with great promptness. It effects upon the system are invigorating: it promotes digestion and improves the secretions generally; it strengthens without producing an undue excitement, and may therefore be used beneficially in some cases, in which the water of the White Sulphur, from its stimulating properties, would prove destructive.