In our selection of material from the large amount of Croghan’s published work, we have chosen that which exemplifies Western conditions under three aspects: First, the period of English ascendency on the Ohio, which is illustrated by three documents of 1750 and 1751. Secondly, the period of French ascendency, hostility toward the English, and war on the frontiers; for this epoch we publish four documents, ranging from 1754 to 1757. The third period, after the downfall of Canada, is concerned with the surrender of the French posts, and the renewed hostility of the Indians; the two journals we publish for this period present interesting material for the study of Western history. Each deals with a pioneer voyage, for Rogers and Croghan were the first Englishmen (except wandering traders or prisoners) to penetrate the Lake Erie region and reach Detroit. The voyage down the Ohio (1765), with its circumstantial account of the appearance of the country, and its description of Indian conditions and relations, is noteworthy. Croghan was a voluminous writer. In addition to the official reports of his journeys, he evidently had the habit of noting down the events of the day in a simple, straightforward manner, so that many manuscripts of his were long extant, presenting often different versions of the same journey. The earlier antiquaries published these as chance brought them to their notice.[13] The official reports themselves were preserved in the colonial archives, and are published in the Pennsylvania and New York collections. It is believed that this is the first attempt to bring together a selection of Croghan material that in any adequate manner outlines his interesting career. The chronological extent of these journals (from 1750-1765) makes those which follow—Post’s of 1758; and Morris’s of 1764—interludes in the events which Croghan describes, thus throwing additional light upon the same period and the same range of territory. R. G. T. A SELECTION OF GEORGE CROGHAN’S LETTERS AND JOURNALS RELATING TO TOURS INTO THE WESTERN COUNTRY—NOVEMBER 16, 1750-NOVEMBER, 1765 CROGHAN TO THE GOVERNOR OF PENNSYLVANIA[14] LOGSTOWN ON OHIO, December [November] the 16th, 1750.[15]