The inconsistency of the Rebels, in getting insanely and murderously furious over the arming of Negroes for the defense of the imperiled Union and the newly gained liberties of the Black Race, when they had themselves already armed some of them and made them fight to uphold the Slave-holders' Rebellion and the continued Enslavement of their race, is already plain enough. [The writer is indebted to the courtesy of a prominent South Carolinian, for calling his attention to the "Singular coincidence, that a South Carolinian should have proposed in 1778, what was executed in 1863-64--the arming of Negroes for achieving their Freedom"--as shown in the following very curious and interesting letters written by the brave and gifted Colonel John Laurens, of Washington's staff, to his distinguished father: HEAD QUARTERS, 14th Jan., 1778. I barely hinted to you, my dearest father, my desire to augment the Continental forces from an untried source. I wish I had any foundation to ask for an extraordinary addition to those favours which I have already received from you. I would solicit you to cede me a number of your able bodied men slaves, instead of leaving me a fortune. I would bring about a two-fold good; first I would advance those who are unjustly deprived of the rights of mankind to a state which would be a proper gradation between abject slavery and perfect liberty, and besides I would reinforce the defenders of liberty with a number of gallant soldiers. Men, who have the habit of subordination almost indelibly impressed on them, would have one very essential qualification of soldiers. I am persuaded that if I could obtain authority for the purpose, I would have a corps of such men trained, uniformly clad, equip'd and ready in every respect to act at the opening of the next campaign. The ridicule that may be thrown on the color, I despise, because I am sure of rendering essential service to my country. I am tired of the languor with which so sacred a war as this is carried on. My circumstances prevent me from writing so long a letter as I expected and wish'd to have done on a subject which I have much at heart. I entreat you to give a favorable answer to Your most affectionate JOHN LAURENS. The Honble Henry Laurens Esq. President of Congress. HEAD QUARTERS, 2nd Feb., 1778. My Dear Father: