There are a few instances of the finding of these instruments, not in association with interments, where the circumstances under which they have been discovered testify to a great, though still indeterminate antiquity. One, for instance, of greenstone, in the Museum of the Society of Antiquaries, is stated to have been “found deep in the clay whilst digging the Chelsea Waterworks at Kingston.”[500] Others in a sand-bed near York[501] were 6 or 7 feet below the surface, and nearly a quarter of a mile from the river which is thought to have deposited the sand. In Wilson’s “Prehistoric Annals of Scotland”[502] is recorded the finding of a greenstone celt in a primitive canoe, formed of a hollowed trunk of oak, at a depth of 25 feet from the surface, at Glasgow; and in the Norwich Museum is one of brown flint, ground all over, 4 1∕4 inches long, similar to Fig. 54, but with facets towards the edge, as if from repeated grinding, which is stated to have been found fixed in a tree in the submarine forest at Hunstanton, by the Rev. George Mumford, of East Winch, in the year 1829. * * * * * On the whole evidence it would appear, from the number of implements of this class which has been discovered, from the various characters of the interments with which they are associated, and from the circumstances under which they have been found, that these stone celts must have been in use in this country during a long period of years; though we still revert to our first confession, that it is impossible to determine at how early a date this period commenced, or to how late a date it may have extended. If, however, the occupation of this part of the globe by man was continuous from the period of the deposit of the old River-gravels unto the present day, it seems probable that some of these implements may claim an almost fabulous antiquity, while in certain remote districts of Britain into which civilization made but a tardy approach, it is possible that their use may have lingered on to a time when in other parts of the country, owing to the superiority and abundance of metallic tools, these stone hatchets had long fallen into disuse. Instances of this comparatively late use of stone celts appear to be afforded by some of the discoveries made in the Orkney and Shetland Isles; and it is doubtful whether in Ireland the use of |151| stone implements did not survive in some parts of the country to a far more recent date than would at first sight appear probable. I have, however, remarked on this subject elsewhere.[503] Sir Arthur Mitchell’s book, “The Past in the Present,” may also be consulted.