The notes to follow formed the basis of the first weeks of a lecture course on Philosophical Investigations initially given at Berkeley in 1960, then irregularly at Harvard and progressively amplified some half dozen times through the 1960s and 1970s. The last of such lectures, offered in 1984, was radically altered since by then my Claim of Reason had appeared. I would not have thought to present these notes without entering into a sort of uneven, late conversation with them, preceding, interrupting, and succeeding them with certain afterthoughts a decade after they were used in a classroom. Why this presentation was made in 1991, and to what purpose, will emerge. The lecture notes appear in italic type, the afterthoughts in upright. Of course - it is more or less the point of the enterprise - I begin with afterthoughts.