Abolition prisoners.
--A small addition was made yesterday to the stock of Abolition prisoners at present on hand, by the arrival from Fredericksburg of Privates V. Miller, co. B, 14th N. Y. reg't, and Henry Slagle, co. F, 136th Pa. reg't. The New Yorker belonged to the famous Brooklyn Zouaves. Both he and his companion looked very downcast. Three of the wounded Abolitionists, all privates, died at the Libby prison on Sunday night. The mortality has been small, considering the desperate nature of most of the wounds.