Narrative of the surveying voyages of his majesty's ships Adventure and Beagle (vol.1): between the years 1826 and 1836 : describing their examination of the southern shores of South America, and the Beagles's circumnavigation of the globe

526 GENERAL REMARKS. II. Dip. The following table exhibits the comparison of Captain Fitz- Roy's observations of the dip in the southern hemispliere, witli those of earlier observers, at stations where the materials for such a comparison exist. Observer. Ascension. Date. Variation. La Caille .. 1754 n. Cook .. .. 1775 8. Sabine .. .. 1822 4. Duperrey . 1 825 1 Fitz-Roy .. 1836 1. St. Helena. La Caille .. 1754 9. Cook .. .. 1775 11. Fitz-Roy.. .. 1836 18. Cape of Good Hope La Caille Bayley Bayley Abercrombie Bayley Freycinet Fitz-Roy 1751 1772 1775 1775 1776 1818 1836 43. 45- 45- 46. 46. 50. 52. 10 N. 57 N. 30 N. 58 N. 39 N. oS. 25 S. 01 S. o S. 37 S. 19 S. 26 s. 31 s. 47 S. 35 S. Mauritius (Port Louis). 29- 29. 29- 30. La Caille .. .. 1754 52. Duperrey .. 1824 53. Fitz-Roy .. 1836 54. Otaheite. Cook .. .. 1773 Cook .. .. 1774 Bayley .. .. 1777 Duperrey .. 1823 Erman .. .. 1830 Fitz-Roy . 1835 Lima and Callao. Feuillee .. .. 1710 10. Humboldt .. i7S9 Duperrey .. 1823 Fitz-Roy .. .. 1835 Valparaiso Malaspiiia .. 1793 Vancouver . . 1 795 Liitke .. .. 1827 King .. .. 1829 Fitz-Roy .. .. 1835 Conception. Feuillee .. .. 1710 55. Perouse .. .. 1786 50. Duperrey .. 1823 44. 17 s. 51 s. 01 S. 43 S. 59 S. 47 S. 03 S. 30.29,5s. 30.13,5s. 9- 44. 44- 39- 40. 38. 30 S. 59 S. 33 S. 03 S. 58 S. 15 s. 56 s. 11 s. 03 s. 30 s. 00 S. 55 S. Observer. Date. Variation. Liitke .. .. 1827 45. 33 S. King .. .. 1829 45. 10 S. Fitz-Roy .. .. 1835 43. 15 S. King George Sound. Vancouver .. 1791 64. 54 S. Flinders .. .. i8oi 64. 01 S. Fitz-Roy .. .. 1836 64. 41 S. Van Diemen's Land. Cook . . . 1777 70. 15 s. Bertrand . 1792 70. 50 s. Dentrecasteaux 1792 70. 30 s. De Rossel 1793 70. 10 S. Fitz-Roy.. 1836 70. 35 S. Sydney. Flinders . 1803 62. 52 S. Freycinet 1819 62. 47 S. Brisbane . 1821 62. 36 S. Duperrey 1824 62. 20 s. Fitz-Roy .. .. 1836 62. 49 S. N.Zealand(B AY OF Islands). Duperrey . 1824 59- 45 S. Fitz-Roy .. .. 1835 59- 32 S. TiERRADEL FuEGO Bayley . . . . ' Lat. 55°- 22' >1774 66, 54 S. Long. 70. 03. 1 King .. .. ) Lat. 55°. 51' .1828 59- 44 S. Long. 67. 34. ) Falkland Islands • Freycinet . 1820 55- 20 S. Duperrey 1822 54- 49 S. Fitz-Roy .. .. 1833-4 53. 25 s. Sta Catharina. Duperrey 1822 22. 54 S. King .. .. 1827 22. 12 s. Rio de Janeiro. La Caille . 1751 20. oS. Freycinet 1817 14. 42 S. King . . . 1826 14. 00 s. Liitke . . . 1827 14. 35 S. Erman 1830 13. 31 s. Fitz-Roy . . . 1832 13. 37 s. We may classify the changes which are taking place in the dip in the southern hemisphere in four divisions, characterised by an