The central stroke of "T" is prolonged downward. Observe line with regard to letters "W, O, C" and "E." The left stroke of "W" is prolonged upward. Observe line with regard to letters "S" of "U. S." and "P" of "POST." The left stroke of "E" is prolonged upward. Observe line with regard to letters "U." and "S." The student who employs these measurements will find that, taking the various dies belonging to one class, _one_ of the above mentioned five line prolongations is sufficient to clearly differentiate any variety of that group from any other. For instance, Class one includes but two varieties. In Var. 1, a line prolongation of the "T" of "POST" cuts through the "O" of "TWO;" in Var. 2 it passes along the second stroke of "W." In case of doubt that single measurement is decisive. As an additional safeguard to the collector the characteristic line measurement is mentioned at the end of the description of each variety. CLASS II. Bust points to intersection of second and third stroke of "W." [Illustration] VARIETY 1 (24 × 26-3/4 mm.) Narrow "U" far from oval line. Buff and Orange. "POST" 7-1/2 mm. There is generally a dot near top of left bar of "U." "U. S." close. "P" nearly vertical. "T" of "TWO" far from left oval; "WO" close; "OC near; "S" of "CENTS" near right oval. Figures of value are exactly in centre of the side ovals. Nose near left oval. "E" line through left stroke of "U." Envelopes only. VARIETY 2. (24 × 25-1/2 mm.) Narrow "U" touching line below. Dark Manila. "POST" fully 8 mm. "P" vertical, much above level of "O." "O" turned to the right. "ST" wide and "T" far from right oval; "WO" very close; "OC" close; "CE" close; "NTS" near inner frame line. Nose near left oval. "E" line to left of "S" of "U. S." Wrapper only. CLASS III. Bust points to last stroke of "W." [Illustration] VARIETY 3. (24-1/2 × 26-1/4 mm.) Narrow "U." "PO" on a level. "O" and "C" near. Buff and Orange. "POST" 7-1/2 mm. "P" slants to left. "POST" evenly spaced. "T" far from right oval. "T" of "TWO" far from left oval; "WO" close; "C" considerably to left of the junction of the inner frame line. "EN" spaced a little wider than "NTS." "S" near right oval. Nose further from oval line than in Variety 1 and 2. Downstroke of right figure "2" is slim. "U" line through "C." Envelopes only. [Illustration] VARIETY 4. (24-3/4 × 26-1/2 mm.) Narrow "U." "OC" and "EN" very wide. Dark Manila. "POST" 8 mm. Top of "P" near outer frame line. "PO" near, but "OS" widely spaced. "T" far from right oval. "T" of "TWO" near left oval. Nose far from left oval. End of downstroke of right figure "2" nearly touches inner oval line. "W" line passes through head of "P." Wrapper only. VARIETY 5. (24-1/4 × 26 mm.) "U" tall, wide open, and near inner frame line. Buff and orange.