...r: [From the New York Evening Post, Aug. 29.] for Matamoras or A Market. A day or two ago the Evening Post called attention to the fact that the first applications for clearances to Matamoras , Mexico, made at the custom-house for three years past have been within a week; and, also, that the convenient town of Brownsville, Texas, a little distance from Matamoras, on the other side of the R...