The aim of the writer of this monograph is to draw attention to a by-path of archaeology where the traveller with some acquaintance with the prehistory, history and folklore of the countryside through which it leads may easily become an adventurer on almost untrodden ground. No pretence is made to say anything new about the well-known megalithic monuments of other parts of the British Isles, but in referring to the race responsible for the introduction of the megalithic culture into these islands more than local significance is given to the ancient folk customs and folklore associated with these archaic monuments. What the writer tries to show is that in a part of England usually supposed to be entirely without prehistoric megaliths there are certainly some large boulders, recognised as mark-stones, that seem to have originally served like purposes to those of many of the more widely known menhirs or standing stones and probably had contemporary origin.