In continuation of my work on the astronomical uses of the Egyptian Temples, I have from time to time, when leisure has permitted, given attention to some of the stone circles and other stone monuments erected, as I believed, for similar uses in this country. One reason for doing so was that in consequence of the supineness of successive Governments, and the neglect and wanton destruction by individuals, the British monuments are rapidly disappearing.

Although, and indeed because, these inquiries are still incomplete, I now bring together some of the notes I have collected, as they may induce other inquirers to go on with the work. Some of the results already obtained have been communicated to the Royal Society, and others have appeared in articles published in Nature, but only a small percentage of the monuments available has so far been examined. Further observations are required in order that the hypothesis set forth in this book may be rejected or confirmed.

In the observations made at Stonehenge referred to in Chapter VII. I had the inestimable advantage of the collaboration of the late Mr. Penrose. Our work there would not have been possible without the sympathetic assistance of Sir Edmund Antrobus, Bart.; Colonel Duncan A. Johnston, R.E., Director-General of the Ordnance Survey, also was good enough on several occasions to furnish us with much valuable information which is referred to in its place. Messrs. Howard Payn and Fowler skilfully and zealously helped in the observations and computations. To all these I am glad to take this opportunity of expressing my obligations.

With regard to the other monuments besides Stonehenge, I have to tender my thanks to the following gentlemen for most valuable local assistance:—

The following have helped me in many ways, among them with advice and criticism:—Principal Rhys, Dr. Wallis Budge, Dr. J. G. Frazer, and Mr. A. L. Lewis.

The assistance so generously afforded in the case of Stonehenge by Colonel Johnston, R.E., in furnishing me with accurate azimuths was continued for the monuments subsequently investigated till his retirement. To his successor, Colonel R. C. Hellard, R.E., I am already under deep obligations.

For the use of some of the Illustrations my thanks are due to the Royal Society, the Society of Antiquaries, the Royal Institute of British Architects, Messrs. Macmillan, and Mr. John Murray.

I have to thank Mr. Rolston, F.R.A.S., one of my staff, for assistance in the computations involved.

NORMAN LOCKYER.

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