Soviet philosophy of science - dialectical materialism - is an area of intellectual endeavor that engages thousands of specialists in the Soviet Union but passes almost entirely unnoticed in the West. It is true that a few Western authors have examined Soviet discussions of individual problems in philosophy of science, such as philosophical issues of biology, or psychology; nonetheless, no one else in the last twenty-five years has tried to study in detail the relationship of dialectical materialism to Soviet science as a whole. It is an unusual experience, rewarding yet worrisome, to be the only scholar making this endeavor.