224 THE ESSEX NATURALIST in spite of the missionary zeal of a few Christian centres of great repute and erudition in earlier centuries. The Irish peasantry held to an undercurrent of pagan fertility religion for long after becoming nominally Christian, as, of course, is the case also in England. When we consider those curious evidences of an earlier cult, even now to be seen over the doorway of at least one Christian church in Ireland, and other extensive evidences of survival of a fertility religion into the present millenium, there seems little doubt that the Irish round towers could have been intended also as phallic emblems thereof'1, as similar towers in India are to this day undoubtedly and obviously symbolic lingams. We simply do not know with certainty : let us leave this controversial field, noting again the points of resemblance to our own examples (the high doorway, often to the East, the look-out windows) and pass to other places where Round Towers un- doubtedly were built for refuge. India has many such towers: at Gowar, the round tower has its door ten feet from the ground. On the road from Arcot to Bangalore on the plains of Hindustan, and on the borders of Mysore, there are many round towers with doors well above ground and with space under the floor at door level for the storage of food and goods (Wise5). Nearer home, among the ancient tribes of the Caucasus, most of the villages have round towers where (I quote from an 1884 account) "the shepherds hold watch and where, in times of peril, they deposit all their valuables, with their women and children" .... "When they have drawn up the rope-ladder to the door some twelve feet above the ground, they occupy a vantage from which they can fight securely"5. In March 1961, there was excavated in Jericho the base of a round tower built for defence of the city some 7000 years ago : the ratio of wall-thickness to external diameter is not unlike that of our own round towers. Italy has round towers at Ravenna and elsewhere which resemble the East Anglian examples quite closely1: one is firmly dated 549 A.D. and all are said to have been built for defence or refuge against the invading Northmen, the Goths who ravaged the plains of Italy in the early middle ages. Sardinia has over 7500 ruinous stone structures of "round tower" type, built however, in the later Bronze Age, say from 3200 to 2400 years ago6. These striking features of the barren island landscape, the Nuraghi, were constructed beyond all doubt for defence and have, perhaps, more in common with the Brochs of Scotland than with the other round towers I have already men- tioned. The normal height of a nuraghe is, or was, about 60 feet, the base diameter being 30 to 40 feet: there is a pronounced tapering or 'batter' towards the top, and the walls, of great thick- ness, serve to accommodate small chambers and a staircase. As to the Scottish Brochs, their age is not so well established7. They are often said to be "Pictish" and this could put them any-