The Sick and Wounded Illinois Soldiers — An Important Mission.

The steamer City of Alton left St. Louis at six o'clock last evening for Memphis and Vicksburg. She has been chartered by Gov. Yates, who, with Auditor Dubois, Secretary Hatch, and others of our public spirited and patriotic citizens, has become personally responsible for the expense, and she will be used as a hospital boat for the care and accommodation of sick and wounded Illinois soldiers from the battlefields before Vicksburg. The boat will be joined at Cairo by Col. Hough, of Chicago, as representative of the Chicago Sanitary Commission, Mr. C. B. Chase, as representative of the State Sanitary Commission from this city, and Colonel J. S. Loomis, who represents the State Department. The representatives from this city left at eleven o'clock last night, going by way of the Great Western and Illinois Central Railroads, intending to meet the boat at Cairo this evening. They take with them several car loads of supplies contributed by citizens and associations, chiefly from Chicago, Springfield, Jacksonville and by the Soldiers Aid Societies in other parts of the State — including ice, vegetables, etc. — They will also be joined at Cairo by a corps of twenty-five surgeons and fifty lady nurses from Chicago, Springfield, Bloomington, Peoria, Rock Island, Jacksonville, Quincy, and others of the principal tows of the State. The boat is to be fitted out as a hospital, and will be used as such for the accommodation of as many of our brave soldiers as possible, and transportation to permanent hospitals as near to their homes as possible.

Col. Loomis, Assistant Adjutant General, is particularly instructed to make out a complete list of all soldiers killed, wounded or missing, with their regiment, the character of their wounds, fate, where found, where left, and other facts in reference to them. This duty is of the utmost importance, and we have reason to believe will be faithfully performed. The citizens of our State will be interested in his report, while to the families of our soldiers it will be of the deepest interest.