The animal probablyregulates them according to the nature of the food on which it haslived. In all parts of the world a rocky and partially protected shoreperhaps supports, in a given space, a greater number of individualanimals than any other station. It may naturally be asked how it comes that although noextensive fossiliferous deposits of the recent period, nor of anyperiod intermediate between it and the ancient tertiary epoch, havebeen preserved on either side of the continent, yet that at thisancient tertiary epoch, sedimentary matter containing fossilremains should have been deposited and preserved at differentpoints in north and south lines, over a space of 1100 miles on theshores of the Pacific, and of at least 1350 miles on the shores ofthe Atlantic, and in an east and west line of 700 miles across thewidest part of the continent? I believe the explanation is notdifficult, and that it is perhaps applicable to nearly analogousfacts observed in other quarters of the world. We were glad to arrive within the walls, when we found allthe alarm was about nothing, for the Indians turned out to befriendly ones, who wished to join General Rosas. In the former editionand Appendix, I have given some facts on the transportal of erraticboulders and icebergs in the Antarctic Ocean. surcingle of. Norhad those antagonistic forces been dormant, which are always atwork wearing down the surface of the land; the great piles ofstrata had been intersected by many wide valleys, and the trees,now changed into silex, were exposed projecting from the volcanicsoil, now changed into rock, whence formerly, in a green andbudding state, they had raised their lofty heads. Thesevalleys, which so long presented an insuperable barrier to theattempts of the most enterprising of the colonists to reach theinterior, are most remarkable. A similar circumstance was observed after anearthquake at Valparaiso, Calabria, and other places, includingsome of the ancient Greek temples. A bird of anotherclosely allied genus, Chionis alba, is an inhabitant of theantarctic regions; it feeds on seaweed and shells on the tidalrocks. Tinochorus rumicivorus. In NewZealand, before the introduction of the potato, the roots of thefern were largely consumed; at the present time, I believe, Tierradel Fuego is the only country in the world where a cryptogamicplant affords a staple article of food.
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- Spring '20