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Allen shews that with a large number of birds inhabiting the northern and southern United States, the specimens from the south are darker-coloured than those from the north; and this seems to be the direct result of the difference in temperature, light, etc., between the two regions.
But, if the weather is unfavourable for fishing at the Rio del Oro, they proceed along the coast to Cape Branco; and thence along the coast to the island of Arguin. The principal sorts of fish on this coast are pagros, called albani by the Venetians; likewise corvi and oneros, which latter are only a larger and darker-coloured species of pagros.
The crystals of feldspar appear to have been first formed, leaving between them the space now occupied by the darker-coloured quartz. This mineral, when a section is made at right angles to the alternate plates of feldspar and quartz, presents broken lines, which have been compared to Hebrew characters.
On this there are two strata of the pale brown mudstone, also like that of S. Josef, separated by a darker-coloured, more argillaceous variety, including the Ostrea Patagonica. Professor Ehrenberg has examined this mudstone for me: he finds in it three already known microscopic organisms, enveloped in a fine-grained pumiceous tuff, which I shall have immediately to describe in detail.
On arriving at the entrance to the glacière, the end of a suggestive ladder is seen under the protecting trunks; and after one or two steps have been taken down the ladder, the effect of the cave below is extremely remarkable, the main features being a long wall covered thickly with white ice in sheets, a solid floor of darker-coloured ice, and a high pyramid of snow reaching up towards the uncovered hole already spoken of.
The inhabitants of the country readily distinguish, even at a distance, the cock bird from the hen. The former is larger and darker-coloured, and has a bigger head. When we were at Bahia Blanca in the months of September and October, the eggs, in extraordinary numbers, were found all over the country.
Some of them are made of a darker-coloured stone, susceptible of a high polish; some of whalebone; and Nicholas mentions one, which he saw in the possession of Tippoui, brother of the celebrated George of Wangarooa, and himself one of the leaders of the attack on the 'Boyd, which, like that of Shungie, which Rutherford speaks of, was of iron, and also highly polished.
There is but one answer; we are ignorant what characters are of essential value to each species; we do not know why white terriers are more subject than darker-coloured ones to the attacks of the fatal distemper; why yellow-fleshed peaches in America suffer more from diseases than the white-fleshed varieties; why white chickens are most liable to the gapes; or why the caterpillars of silkworms, which produce white cocoons, are not attacked by fungus so much as those that produce yellow cocoons?
The inhabitants of the country readily distinguish, even at a distance, the cock bird from the hen. The former is larger and darker-coloured, and has a bigger head.
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