“Yesterday several of us visited a cotton factory not far from the camp, which is owned by a Scotchman, who conducts the concern with ability. There are fifty girls employed, several of whom are from the States. The machinery was imported from New York. “We have just received word to garrison the city, in place of General Worth’s division. Yesterday they started on their way to join General Scott. The 3d regiment has already started, so I must postpone finishing till we are moved. “_18th._--During the interval between these dates, I have been so employed, that I have not been able to finish these notes. We have so many duties to perform, that there are few leisure moments indeed for writing. One hundred men are detailed from each of the Indiana regiments for guard; besides others to work on the fortifications. Last night our company was on patrol. We were up all night traversing the streets and alleys, and every suspicious corner in the city. But there is so much excitement connected with these duties, that we greatly prefer them to the monotony of camp life. “We are now pleasantly situated, having comfortable quarters and good provisions. The Greys sustain that character which they so proudly bore at home. Yesterday General Butler remarked to his aid-de-camp, while on brigade drill, that we were the finest volunteer company he had seen in the service. Our belts were perfectly white, and our arms brightly burnished, which made the contrast so perceptible. “The city of Saltillo is situated on the side of a hill. It has narrow streets and side walks, which are roughly paved with stone. The houses are built of stone and mud bricks, whitened over on the outside with plaster. They have flat roofs. The city boasts of two cathedrals, a nunnery and four plazas. In the centre of the plazas are fountains continually playing from the centre of large basins.