Finally, he relies too much upon sarcasm and personal invective as agents. He has a theory on this matter; and we feel _sure_ that it is erroneous. Not that invective is to be forbidden. Not that personal criticism is always out of place, or always useless. We are among the "all men" whom Thoreau declared to be "enamored of the beauty of plain speech." We ask no man in public or private life to wear a satin glove upon his tongue. We believe, too, in the "noble wrath" of Tasso's heroes, When the heart _must_ burn, let the words be fire. It is just where personal invective begins to be used as matter of _theory and system_ that it begins to be used amiss. Let the rule be to spare it, if it _can_ be spared, and to use it only under the strictest compelling of moral indignation. And were not Mr. Phillips among the most genial and sunny of human beings, really incapable of any malign passion, he would fool the reactive sting of this invective in his own bosom, and so become fearful of indulging it. Still it must be said that he has the genius and function of a critic. He is the censor of our statesmanship. He is the pruner of our politics. Let his censure be broad and deliberate, that it may be weighty; let his pruning be with care and kindness, that it may be with benefit. _Systems of Military Bridges in Use by the United States Army, those adopted by the Great European Powers, and such as are employed in British India._ With Directions for the Preservation, Destruction, and Reestablishment of Bridges. By Brigadier-General GEORGE W. CULLUM, Lieutenant-Colonel, Corps of Engineers, U.S. Army, Chief of Staff of the General-in-Chief, etc., etc. New York: D. Van Nostrand.