‘Observation not guided by ideas, even hypothetical ideas’, says Professor Wolf, ‘is blind ; just as ideas not tested by observation are empty’. The student of megalithic monuments has as constantly to regret that early antiquaries were not more aware of the necessity of making accurate plans and of recording morphological and constructional details of the monuments—many alas, now ruined or vanished—which they visited, as he has to deplore their delight in formulating theories which they never tested by fieldsurvey ; but he has also to cope with evils more dangerous even than these, namely observation so dominated by false or imprudent hypotheses that it results in a distorted vision worse by far than mere blind observation or empty ideas. Some of these hypotheses—like the Druids, the Ancient Egyptians, the metal-working Prospectors, the megalithic race, solstitial and clock-star alignments,—to mention only a few, have been disproved by research and flourish today only among perverse and illogical archaeologists. Others—such as the concept of the Montelius dolmen here examined in its relation to southern Britains—while just as inadequate and inaccurate, are the comrnonplaces of modem text-books.