a stone and bone age exists at the present day, only modified by the use of such metal implements as they can obtain by barter or exchange: and this appears to have been the state of northern Europe, till, with their conversion to Christianity, the new civilization was domesticated among its inhabitants. [Footnote 2: Those three treatises were afterwards republished in one volume, small folio, with all the plates, &c., in London, 1725. It is from this volume that the above is abstracted.] [Footnote 3: Cæsar, 'De Bell. Gal.' vi 13-20.] [Footnote 4: 'Hist. Nat.' xxix. 3.] [Footnote 5: 'Historia,' v. 31.] [Footnote 6: 'Geographica,' iv. 273.] [Footnote 7: Tacitus, 'Ann.' xiv. 29.] [Footnote 8: See controversy between M. Bertrand and M. Henri Martin, in volume of 'Congrès préhistorique' (Paris, 1867), 193, 207, &c. See also 'Revue archéologique,' août, 1864, 144.] [Footnote 9: For further information on the subject, the reader is referred to 'Tree and Serpent Worship,' by the author, p. 26 _et seq._, where the subject is treated of at length.] [Footnote 10: 'Archæologia,' xxv. 188 _et seq._] [Footnote 11: Mr. Ellis, 'Gent. Mag.' 4th series, ii. 317.] [Footnote 12: 'Proceedings of the Archæological Institute, Salisbury,' volume 113.] [Footnote 13: Diodorus, ii. 47.] [Footnote 14: Ibid. v. 21 _et seq._] [Footnote 15: The volume containing the account of the proceedings of the congress has not yet been published; so those who were not present cannot feel sure to what extent these modifications were carried or admitted. A short account of the Congress was published by Gen. Lefroy, in the 'Journal of the Archæological Institute,' Nov. 1869, p. 58 _et seq._] [Footnote 16: "According to an analysis made by Sir John Lubbock, of the contents of 250 tumuli described by Sir Richard Colt Hoare, in the first volume of his 'Ancient Wiltshire,' 18 only had any implements of stone, only 31 of bone, 67 of bronze, and 11 of iron, while one-half of them contained nothing to indicate their age; but whether those that contained nothing are earlier or more modern is by no means clear."--_Prehistoric Times_, 2nd edit. p. 131.]