Note C — THE 1853-55 SERIES.

Note:—The numbers used in this list are arbitrary, consecutive, and have no relation to the numbers used in any other work of a similar nature. Under the heading "Paper," "W." means white and "B." buff paper. The numbers under the headings "Knife" and "Size" are those of the knives illustrated and described in the Catalogue for Advanced Collectors and in Bartel's Catalogue of United States Envelopes, 1904 edition. Those under "Dimensions" give the size of the envelope in millimetres.