5 Brentford, Middlesex. From Public Library, Brentford. the bed of the Thames, above Layton Collection. the G.W.R. dock. 6 Richmond, Surrey. From the Public Library, Richmond. bed of the Thames, at the Lloyd Collection. No. 816. lock and weir. 7 Newcastle-upon-Tyne. From Black Gate Museum, the Tyne. Newcastle-upon-Tyne. No. 88. [Illustration] FOOTNOTES: [Footnote 1: Beddoe (1885) 29; Holmes (1907) 434, 437, 440; Macalister (1921) 2. 41-49.] [Footnote 2: Moir (1921) 390-411; Burkitt (1921) 2. 456, 7; Man xxii. 33.] [Footnote 3: Macalister (1921) 1. 148-177.] [Footnote 4: Keith (1915) 1. 228-244; Schötensack (1908).] [Footnote 5: Keith (1915) 1. 293-452; Dawson, etc. (1913); Boule (1915).] [Footnote 6: Keith (1915) 1. 178-193; Duckworth (1913); Macalister (1921) 1. 222, where other authorities are cited.] [Footnote 7: _Nature_, 12th October, 1916.] [Footnote 8: The question is well discussed by Macalister (1921) 1. 196-204, who gives numerous references.] [Footnote 9: Osborn (1921) 585, 6.] [Footnote 10: Obermaier (1906-7).] [Footnote 11: Burkitt (1921) 1. 95-97; Macalister (1921) 1. 215-218, 255-259, 585-590.] [Footnote 12: Obermaier (1906-7); Burkitt (1921) 1. 47; Macalister (1921) 1. 584, where other authorities are cited.] [Footnote 13: _Vid. infr._ p. 6.] [Footnote 14: Macalister (1921) 1. 285-314, where all authorities are fully cited; Keith (1915) 118.] [Footnote 15: Macalister (1921) 1. 298-301; who cites Boule (1911-13).] [Footnote 16: Keith (1915) 1. 122-124, 156.] [Footnote 17: Keith (1915) 1. 102-136; Macalister (1921) 1. 285-314.] [Footnote 18: Smith (1922) 464, 465; but a different view is held by Woodward (1922) 579.] [Footnote 19: Burkitt (1921) 1. 72, 92, 97, 98.] [Footnote 20: Macalister (1921) 1. 581, who cites Hrdlička.] [Footnote 21: Macalister (1921) 1. 313; Keith (1915) 1. 135.] [Footnote 22: Vid. Appendix I.] [Footnote 23: From Capsa, the old name for Gafra in Tunisia; Morgan, etc. (1910-1).] [Footnote 24: Macalister (1921) 1. 576-580.] [Footnote 25: Burkitt (1921) 1. 95, 106.] [Footnote 26: Seligman (1921).] [Footnote 27: Seligman (1921) 128.] [Footnote 28: Macalister (1921) 1. 581.] [Footnote 29: Fleure (1920).] [Footnote 30: Testut (1889).] [Footnote 31: Keith (1915) 1. 62-68.] [Footnote 32: Keith (1915) 1. 66.] [Footnote 33: Keith (1915) 1. 65.] [Footnote 34: Fleure (1920).] [Footnote 35: Ripley (1900) 39, 173.] [Footnote 36: Ripley (1900) 39, 40.] [Footnote 37: Parkyn (1915); Burkitt (1921) 1. 192-272.] [Footnote 38: Fleure (1920) 19-21.] [Footnote 39: Corrêa (1919) 121, 122.] [Footnote 40: Bourguignat (1868) 43, 48, 49, Pl. vii., viii.] [Footnote 41: Ripley (1900) 165-179.] [Footnote 42: Thus Burkitt (1921) 1. 42, 127, but Macalister (1921) 1. 373, 376, 582, states that the steppe conditions had passed before the beginning of the Solutrean period.]