When he received the order of our Government for the Monitor his plans were already drawn. He had been at work for years perfecting his system of aquatic attack, originally designed for the protection of Sweden against foreign aggression, and had in 1854 submitted his drawings to the Emperor of France. The story of his proceedings in Washington is familiar to our readers, but in these notable volumes of Mr. Church it is told with a fulness of detail never before attempted. The Monitor in all its parts was designed by Ericsson, and, fortunately for the country, he was allowed to superintend its construction. His former plans, however, had to be carefully revised to meet the novel conditions of life in a submerged structure. It was estimated that this iron-clad vessel contained at least forty patentable contrivances. The entire resources of modern engineering knowledge were brought to bear upon the solution of the problem of an impregnable battery, armed with guns of the heaviest calibre then known, hull shot-proof from stern to stern, rudder and propeller protected against the enemy's fire, and above all, having the advantage of light draught. Ericsson was made responsible for the successful working of his vessel in every respect. The anxiety of the Government was such that every stage in the progress of the work toward completion was watched with restless interest. Ericsson's nerves and sinews seemed to be made of steel. He scarcely took time to eat or sleep, and he was deluged with a continuous tempest of criticism, warning, and advice, from those who knew nothing about the intricacies of science involved in the undertaking. The least halting, even trifling delay, confusion of mind, or weakness of body, and the story of Hampton Roads might not have been written.