AD, DLC-RTL. The dating of this document by Nicolay and Hay [July 1, 1850?] has been rejected because the editors can find no reason for so dating it. The date, c. September 25-30, 1848, is based on two principal facts: (1) Lincoln visited Niagara Falls en route from Boston to Chicago, September 23-October 5, 1848; (2) the document is in appearance of paper and handwriting contemporary with the documents of speeches written in 1848 in Washington. The content suggests the sort of meditation and recapitulation of observations and reflections which would be psychologically apropos following a visit to the Falls, and one suspects that Lincoln's boat trip from Buffalo provided the leisure to begin, if not to conclude, the meditation. Nicolay and Hay entitle the piece ``Notes for a Lecture,'' but the subject itself should suffice. The manuscript stops abruptly with an unfinished sentence.