| [7] | Consolations in Travel, or the Last Days of a Philosopher. |
| [8] | Prehistoric Annals of Scotland, vol. i. p. 41. |
| [9] | Antiguedades Prehistoricas de Andalusia, Madrid, 1868. |
| [10] | The Land of Israel: a Journal of Travels in Palestine, 1865, p. 11. |
| [11] | J. Trimmer: Jour. Geol. Soc., vol. ix. |
| [12] | Prehistoric Annals of Scotland, 1851, 1st Ed. p. 29. |
| [13] | Archæologia, vol. xiii. p. 206; vol. xxxviii. p. 301. |
| [14] | Antiquity of Man, 4th Ed. p. 190. |
| [15] | Archæologia, vol. xxxviii. p. 296. |
| [16] | Prehistoric Annals of Scotland, 1st Ed. p. 33. |