Art. 448 , “Witnesses, who are incompetent.” pp=”120″ href=”https://books.google.com/books?id=MzrOAAAAMAAJ&lpg=PA120&vq=%22third%20generation%20inclusive%22&dq=q%3D%22third%20generation%20inclusive%22&pg=PA120#v=onepage&q=%22third%20generation%20inclusive%22&f=false”Oldham and White
Witnesses, who are incompetent.
Art. 448.  All Negroes and Indians, and all persons of mixed blood, descended from negro ancestry, to the third generation inclusive, though one ancestor of each generation may have been a white person, shall be incapable of being a witness in any case whatever, except for or against each other.(b)
(b) Negro testimony is inadmissible in all cases, except for and against each other. Rice v. Lemon, 16 Tex. Rep. 593.