The "Beagle" sailed from the Rio Plata, never again to enter itsmuddy stream. Again, at Tristan d'Acunha in theAtlantic, Carmichael states that the only two land-birds, a thrushand a bunting, were "so tame as to suffer themselves to be caughtwith a hand-net. The centralpart is coarsely cellular, the cells decreasing in size towards theexterior; where there is a shell-like case about the third of aninch in thickness, of compact stone, which again is overlaid by theoutside crust of finely cellular lava. prismatic structure of. The morning before we anchored atPorto Praya, I collected a little packet of this brown-colouredfine dust, which appeared to have been filtered from the wind bythe gauze of the vane at the masthead. Helena" page 123. The whole distance is over a level desert plain, withnot more than two or three houses. The terraces are theremuch broader, and may be called plains, in some parts there are sixof them, but generally only five; they run up the valley forthirty- seven miles from the coast. (PLATE 63. Stem 6 to 10 feet. (8/9. I mention these trifling circumstances, because incertain cases they might explain the occurrence of a number ofuninjured bones in a cave, or buried under alluvial accumulations;and likewise the cause why certain animals are more commonlyembedded than others in sedimentary deposits. " I understand that the male emu inthe Zoological Gardens takes charge of the nest: this habit,therefore, is common to the family.
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