ON the 19th of April we are to have a holiday to commemorate the Battle of Lexington and Concord. At both towns there will be centennial celebrations, which "citizens of the country generally are invited to attend."

A circular informs us that the "occasion will be honored by the presence of the Executive of the United States, the State of Massachusetts, representatives of the different departments of the National and State governments, literary, and other organizations, and distinguished individuals of the Republic, whose words of eloquence and wisdom will add interest to the occasion." The order of exercises at Lexington is as follows:-

I. Centennial Salute at Sunrise.

II. Reception of the National, State and other distinguished guests.

III. Grand Procession, 10 o'clock.

IV. Commemorative Exercises in Tent on Lexington Common, including Oration, the unveiling of Statues of John Hancock and Samuel Adams.

V. Dinner.

VI. National Salute at Sunset.

VII. Grand Centennial Levee and Ball in the evening.