For the purpose of these notes, and to ascertain that the vallum had not been raised by an interment, a partial excavation has been made. A narrow trench cut from east to west disclosed that the entire monument is composed of loose stones, seemingly hand-laid, upon the natural soil. On the west side the raising of the vallum was an example of careful and permanent work. Commencing from the outside there was a foundation of large stones sloping inwards, and acting as a retaining wall for the stones above, and a similar foundation marked the inside margin. In the centre of the vallum was a core of stones about two feet high leaning towards each other, and filled in with horizontal stones, thus forming the base of a solid triangle. Above this the loose stones were built up to the required height and form. An examination of some of the principal stones of the circle disclosed that they were supported by or resting upon others of large size. As it was not desirable to disturb more than was necessary to disclose the general construction, and to remove turf which had overgrown some of the pillars, a very small proportion of the whole was searched, and this did not yield a single relic of the work of man. So far, we have dealt with the effect of circles as we see them; let us look to the cause. Imagine an agricultural people without any knowledge of the seasons or months of the year, save from the gradual changes from cold to warm weather, and from long to short days; without the means of estimating the length of the latter, and without even the power of numbering the years or knowing whether they themselves were young or old, for except, perhaps, in the calm pools of water, their very appearance would be strange to them. A few treacherously warm days in December, and they would sow their corn to the winds. Preparation for winter needs or summer work would be impossible, and all would end in famine and waste—all would be confusion. No wonder that, like nature, they turned to the sun—the almanac of all time. No wonder their chief astronomer became the chief priest of the tribe. So is it to-day with uncivilized races of mankind. So, also, is the superstition of astrology in civilized races but a survival of the days when the seer alone cast his horoscope and foretold to the people the coming of the seasons, the time for preparation and all that was necessary for their continued existence. Sun worship followed, and religion and astronomy were blended for ages to come. Sir Norman Lockyer and the late Mr. Penrose have scientifically demonstrated the relation of Stonehenge with the rising of the sun over the Friar’s Heel at the summer solstice, where tradition still gathers people together on the morn of Midsummer day; but it is with the more primitive and varied circles of our hilly county that we are concerned, and these may be treated, as indeed they probably were by their designers, in a more primitive method.