The usages and precedents of the British Parliament constitute the basis of all parliamentary law amongst people who speak the English language. Many years ago Thomas Jefferson wrote a book, which is called “Jefferson’s Manual of Parliamentary Practice.” It is formed of the precepts of the United States Constitution, and the regulations early adopted in the United States Senate, collated with a digest of English Parliamentary practice. This book is a well-known authority in this country. Mr. Barclay furnishes the House with a manual containing a digest of its own rules, so much of Jefferson’s Manual as governs the proceedings of the House, together with the precedents of order, usages of the House, etc., which is really a complete and independent code by which the House is guided. The rules and laws of the House of Representatives of the United States are universally adopted for the government of all State and local conventions, and form the basis of the rules and practice of nearly all State legislatures. The influence of Mr. Barclay’s knowledge and judgment, therefore, in the parliamentary affairs of the country, will be seen to be very great. A correspondent of much repute, in a letter some time ago, which has been widely copied, made the clerk to the late Speaker, an estimable young man, entirely innocent of the profundities and bewildering intricacies of parliamentary law, the actual monitor of Mr. Colfax--a mistake hardly necessary to correct. Mr. Barclay has seen the rise and decline of the reign of eight different Speakers, Mr. Blaine being the ninth on the list. Of the Speakers whose sceptres have withered, whose gavels have sounded for the last time, Mr. Barclay gives Mr. Colfax the credit of being the best parliamentarian, as well as the hardest and most persevering student of the law. Mr. Barclay has seen the proud honor of Speaker bestowed upon Robert C. Winthrop, Howell Cobb, Linn Boyd, N. P. Banks, James L. Orr, William Pennington, Galusha A. Grow, Schuyler Colfax, and James G. Blaine. During the long years of treason and rebellion he was a silent witness of the moral battles in the House. This warfare steadily preceded the smoke of the cannon and the surgeon’s glittering knife. It is true Mr. Barclay stores up only the actual substance of the House; and yet how much he might reveal in regard to this august body which is left out of the official record, as well as out of “Gobright’s Recollections of a Third Century,” and also the awful columns of the Congressional Globe.