The sociology of knowledge can most generally be defined as the discipline devoted to the social origins of thought. It is an analysis concerned with specifying the existential basis of thought, and with establishing the relationship obtained between mental structures or thought, and that existential basis. Some very interesting and difficult problems arise from this conception of the sociology of knowledge. Perhaps the most obvious of these is whether or not a sociology of knowledge, as here conceived, is theoretically possible. (...) This is a problem I do not intend to deal with at present because limitations of time prevent me from doing even partial justice to it. (shrink)