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Rh group of races among mankind, or from its having been practised by people at a certain stage of civilization, or under peculiar circumstances, and this it is our business to try to find out and define. But to do this, the first thing that seems requisite is to put aside all previously conceived notions on the subject, and to treat it as one entirely new, and as depending for its elucidation wholly on what can be gathered from its own form and its own utterances, however indistinct they may at first appear to be.

Bearing this in mind, we have no difficulty in beginning our history of megalithic remains with the rude stone cists, generally called kistvaens, which are found in sepulchral tumuli. Sometimes these consist of only four, but generally of six or more stones set edgeways, and covered by a capstone, so as to protect the body from being crushed. By degrees this kistvaen became magnified into a chamber, the side stones increasing from 1 or 2 feet in height to 4 or 5 feet, and the capstone becoming a really megalithic feature 6 or 10 feet long, by 4 or 5 feet wide, and also of considerable thickness. Many of these contained more than one funeral deposit, and they consequently could not have been covered up by the tumuli till the last deposit was placed in them. This seems to have been felt as an inconvenience, as it led to the third step, namely, of a passage communicating with the outer air, and formed like the chambers of upright stones, and roofed by flat ones extending across from side to side. The most perfect example of this class is perhaps that in the tumulus of Gavr Innis in the Morbihan. Here is a gallery 42 feet long and from 4 to 5 feet wide, leading to a chamber 8 feet square, the whole being covered with sculptures of the most elaborate character.

A fourth stage is well illustrated by the chambers of New Grange, in Ireland, where a similar passage leads to a compound or cruciform chamber rudely roofed by converging stones. Another beautiful example of the same class is that of Maeshow in the Orkneys, which, owing to the peculiarity of the stone with which it is built, comes more nearly to the character of microlithic art than any other example. It is probably among the last if not the very latest of the class erected in these isles, and by a curious concatenation of circumstances brings the megalithic form of art