For Militia insignia worn about 1835, the best documentation is to be found in _U.S. Military Magazine_, published between 1839 and 1842 by Huddy and Duval of Philadelphia, and in _New York Military Magazine_, published by Labree and Stockton of New York during 1841. In 1939, Frederick P. Todd described the Huddy and Duval prints in detail (_Journal of the American Military Institute_, 1939, vol. 3, no. 3, pp. 166-176). However, evaluation and consideration of over-all design development and comparison with dated biographical specimens of the earlier period, before 1835, are difficult and must be done cautiously, as there is no orderly pattern. One generalization does seem clear: during the decade after 1821, when the Regulars discarded large cap plates, the Militia almost universally adopted them and continued to wear them well into the 1840's. Very few insignia include the maker's name or initials, but when they do, bracketing within a definite period is relatively easy. Similarly, when a cap plate appears to be original to a cap, the design of the cap and its maker's label, if included, are of great help. Finally, when there is nothing else to rely on, the "feel" of the specimen, gained through the experience of studying several thousand, has been used, although with reluctance. The year 1800 was selected as the opening date of the study because it was in that year that the first metal ornament was prescribed to designate a particular branch of service. The closing date of 1851 was chosen because Regular Army devices for that year and thereafter are well documented in uniform regulations, manuals, and catalogs of manufacturers such as William Horstmann and Sons. Militia dress after that general date becomes so increasingly complex that it should be attempted only as a separate study.