All this work cannot be accomplished in a day, a week, or a month. The full preparations required to render a campaign successful must have been the result of long, patient, thoughtful consideration and organization. It is no time to teach sailors seamanship in a hurricane. They must know where to find the ropes and what to do with them, with the spray dashing in their eyes and the black clouds scurrying across the sky. It is no time for staff officers to begin their duties when a great army is to be moved. Then it is needed that every harness strap, every gun-carriage wheel, every knapsack, every soldier's shoe should have been provided and should be in serviceable order; that the men should have had their regular fare, and have been kept in the healthiest condition; that clear and explicit information be ready on all details. Prepared by the assiduous, intelligent labor of a vigilant and faithful staff, an army becomes a compact, homogeneous mass--without individuality, but pervaded by one animating will--cohesive by discipline, but pliant in all its parts--impetuous with enthusiasm, but controlled easily in the most minute operations. These remarks, relative to the requirements for an effective staff, pertain to all grades of organization. The staff officers at the headquarters of the army organize general arrangements and supervise the operations of subordinate officers of their department at the headquarters of corps; these have more detailed duties, and, in their turn, supervise the staffs of the divisions; the duties of these again are still more detailed, and they supervise the staffs of brigades; these finally are charged with the specific details pertaining to their commands, supervising the staffs of the regiments, who are in direct communication with the officers of companies. Prepared for service by the unremitting labors of the staff officers, it is seldom that the army cannot move in complete order at six hours' notice. Think what preparation is required for a family of half a dozen to get ready to spend a month in the country--how tailors and milliners and dressmakers are put in requisition--how business arrangements must be made--how a thousand little vexing details constantly suggest themselves which need attention. Think of a thousand families--ten thousand--making these preparations! What a vast hurly burly! What an ocean of confusion! How many delays and disappointments! During the fortnight or month which has elapsed while these families have been getting ready, an army of fifty or a hundred thousand men has marched a hundred miles, fought a battle, been reequipped, reclothed, reorganized, and, perhaps, the order of a nation's history has experienced an entire change. Our next paper will describe in detail the operations of the staff departments. SLEEPING.